diff --git a/_extensions/MHellmund/julia-color/_extension.yml b/_extensions/MHellmund/julia-color/_extension.yml
new file mode 100644
index 0000000..b264a63
--- /dev/null
+++ b/_extensions/MHellmund/julia-color/_extension.yml
@@ -0,0 +1,17 @@
+title: Julia-color
+author: Meik Hellmund
+version: 1.0.0
+quarto-required: ">=99.9.0"
+contributes:
+  formats:
+    common:
+      filters:
+        - "ansi2htmltex.lua"
+    html:
+      monofont: "JuliaMono"
+      css:
+        - "resources/css/ansicolor.css"
+        - "resources/css/juliamono.css"
+    pdf:
+      include-in-header:
+       - "resources/tex/juliainc.tex"
diff --git a/_extensions/julia/ansi2htmltex.lua b/_extensions/MHellmund/julia-color/ansi2htmltex.lua
similarity index 74%
rename from _extensions/julia/ansi2htmltex.lua
rename to _extensions/MHellmund/julia-color/ansi2htmltex.lua
index 6615353..8e41bce 100644
--- a/_extensions/julia/ansi2htmltex.lua
+++ b/_extensions/MHellmund/julia-color/ansi2htmltex.lua
@@ -1,10 +1,5 @@
--- this is essentially 
+-- based on
 -- https://github.com/jupyter/nbconvert/blob/main/nbconvert/filters/ansi.py
--- converted to lua
-
--- good list of ANSI escape sequences:
--- https://gist.github.com/fnky/458719343aabd01cfb17a3a4f7296797
-
 
 local ANSI_COLORS = {
     "ansi-black",
@@ -60,18 +55,8 @@ local function get_extended_color(numbers)
     return {r, g, b}
 end
 
-
---[=[
-local re = require "re"
-
-local ANSI = re.compile [[
-    '\x1b%[' {.*?} {[@-~]} 
-    ]]
-
---]=]
-
-local function LaTeXconverter(fg, bg, bold, underline, inverse)
-    if not (fg or bg or bold or underline or inverse) then
+local function LaTeXconverter(fg, bg, bold, light, italic, underline, inverse)
+    if not (fg or bg or bold or light or italic or underline or inverse) then
         return "",""
     end
 
@@ -116,6 +101,16 @@ local function LaTeXconverter(fg, bg, bold, underline, inverse)
         endtag  = "}" .. endtag
     end
 
+    if light then
+        starttag = starttag .. [[\textlight{]]
+        endtag  = "}" .. endtag
+    end
+
+    if italic then
+        starttag = starttag .. [[\textit{]]
+        endtag  = "}" .. endtag
+    end
+
     if underline then
         starttag = starttag .. [[\underline{]]
         endtag  = "}" .. endtag
@@ -123,8 +118,8 @@ local function LaTeXconverter(fg, bg, bold, underline, inverse)
     return starttag, endtag
 end
 
-local function HTMLconverter(fg, bg, bold, underline, inverse)
-    if not (fg or bg or bold or underline or inverse) then
+local function HTMLconverter(fg, bg, bold, light, italic, underline, inverse)
+    if not (fg or bg or bold or light or italic or underline or inverse) then
         return "",""
     end
     local classes = {}
@@ -156,6 +151,14 @@ local function HTMLconverter(fg, bg, bold, underline, inverse)
         table.insert(classes, "ansi-bold")
     end
 
+    if light then
+        table.insert(classes, "ansi-light")
+    end
+
+    if italic then
+        table.insert(classes, "ansi-italic")
+    end
+
     if underline then
         table.insert(classes, "ansi-underline")
     end
@@ -196,7 +199,8 @@ local function codeBlockTrans(e)
 
     local texenv="OutputCell"
     local codeclass=""
-    if string.find(e.text, "\u{a35f}\u{2983}") then
+    -- if string.find(e.text, "\u{a35f}\u{2983}") then
+    if string.find(e.text, "\x1b%[") then
         texenv = "AnsiOutputCell"
         codeclass = "ansi"
     end
@@ -206,12 +210,18 @@ local function codeBlockTrans(e)
     end
 
     local out=""
-    -- if string.find(e.text, "\x1b%[") then
-    if string.find(e.text, "\u{a35f}\u{2983}") then
+    local text = e.text
+
+    -- we remove links (eg in julia ParseErrors. THey link to local files, so they are useless anyway)
+    text = text:gsub("\x1b%]8;.-\x1b\\", "")
+    
+    if string.find(text, "\x1b%[") then
+    -- if string.find(text, "\u{a35f}\u{2983}") then
         local bold = false
+        local light = false
+        local italic = false
         local underline = false
         local inverse = false
-        local text = e.text
         local chunk = ""
         local fg = nil
         local bg = nil
@@ -221,8 +231,9 @@ local function codeBlockTrans(e)
 
         while text ~= "" do
             numbers = {}
-            -- local s1, e1, c1, d1 = string.find(text, "\x1b%[(.-)([@-~])")
-            local s1, e1, c1, d1 = string.find(text, "\u{a35f}\u{2983}(.-)([@-~])")
+            -- [@-~]: matches single char between 64 and 126
+            local s1, e1, c1, d1 = string.find(text, "\x1b%[(.-)([@-~])")
+            -- local s1, e1, c1, d1 = string.find(text, "\u{a35f}\u{2983}(.-)([@-~])")
             if s1 then
                 if d1 == "m" then
                     for i in string.gmatch(c1, "([^;]*)") do
@@ -238,9 +249,9 @@ local function codeBlockTrans(e)
 
             if chunk ~= "" then
                 if bold and type(fg)=="number" and fg<8 then
-                    starttag, endtag = converter(fg+8, bg, bold, underline, inverse)
+                    starttag, endtag = converter(fg+8, bg, bold, light, italic, underline, inverse)
                 else
-                    starttag, endtag = converter(fg, bg, bold, underline, inverse)
+                    starttag, endtag = converter(fg, bg, bold, light, italic, underline, inverse)
                 end    
                 out = out .. starttag .. chunk .. endtag
             end
@@ -253,20 +264,26 @@ local function codeBlockTrans(e)
                     bold = false
                     inverse = false
                     underline = false
-                elseif n == 1 then
+                elseif n == 1 or n == 5 or n == 6 then  -- bold and blink
                     bold = true
+                elseif n == 2 or n == 8 then -- 'dim' and 'hide'
+                    light = true
+                elseif n == 3 then
+                    italic = true
                 elseif n == 4 then
                     underline = true
-                elseif n == 5 then
-                    bold = true -- 'blinking'
                 elseif n == 7 then
                     inverse = true
-                elseif n == 21 or n == 22 then
+                elseif n == 21 or n == 22 or n == 25 then
                     bold = false
+                elseif n == 23 then
+                    italic = false
                 elseif n == 24 then
                     underline = false
                 elseif n == 27 then
                     inverse = false
+                elseif n == 22 or n == 28 then
+                    light = false
                 elseif n >= 30 and n <= 37 then
                     fg = n - 30
                 elseif n == 38 then
@@ -290,7 +307,7 @@ local function codeBlockTrans(e)
             end
         end
     else
-        out = e.text
+        out = text
     end
     if fmt == 'html' then
         return pandoc.RawBlock(fmt,
@@ -324,67 +341,13 @@ local function divCodeBlockNoHeader1(e)
     for i, el in pairs(c) do
         if el.t == 'Header' then
             el.level = 6
-            -- elneu = pandoc.Para(el.content)
-            -- c[i] = elneu
-        end
-        if el.t == 'CodeBlock' then
-            if el.classes:includes("jldoctest") then
-                x,i = el.classes:find("jldoctest")
-                el.classes:remove(i)
-            end
         end
     end
     return e
 end
 
--- test if two divs should be merged
-local function testmerge(d1, d2)
-    return d1 and d1.t == "Div"  and d1.classes:includes("cell-output") and #d1.content == 1
-        and  d2 and d2.t == "Div"  and d2.classes:includes("cell-output") and #d2.content == 1
-        and  d1.content[1].t == "CodeBlock" and not d1.classes:includes("cell-output-stderr")
-        and  d2.content[1].t == "CodeBlock" and not d2.classes:includes("cell-output-stderr")
-end
-
--- merge (div (codecell (text1)), div (codecell(text2))) to div(codecell(text1+text2))
-local function blockMerge(es)
-    local nl = ""
-    for i = #es-1, 1, -1 do
-        if testmerge(es[i], es[i+1]) then
-            str1 = es[i].content[1].text
-            str2 = es[i+1].content[1].text
-            nl = "\n"
-            if es[i].classes:includes("cell-output-stdout") and  es[i+1].classes:includes("cell-output-stdout") then
-                if str1:sub(-1) == "\n" then
-                    nl = ""
-                end
-                if str2:sub(1, 1) == "\n" then
-                    nl = ""
-                end
-            end
-            es[i].content[1].text = str1 .. nl .. str2
-            es:remove(i+1)
-        end
-    end
-    return es
-end
-
-local function metaAdd(meta)
-    --for key, val in pairs(PANDOC_READER_OPTIONS) do
-    --    quarto.log.warning(key, val)    
-    --end
-    quarto.doc.addHtmlDependency({name='ansicolors',
-        stylesheets = {'resources/css/ansicolor.css'}})
-    quarto.doc.addHtmlDependency({name='juliamonofont',
-        stylesheets = {'resources/css/juliamono.css'}})
-    if quarto.doc.isFormat('latex') then
-        quarto.doc.include_file("in-header", "resources/juliainc.tex")
-    end
-end
-
 return {
     {Div = divStderr},
     {Div = divCodeBlockNoHeader1},
-    {Blocks = blockMerge},
     {CodeBlock = codeBlockTrans},
-    {Meta = metaAdd}
 }
diff --git a/_extensions/julia/resources/css/ansicolor.css b/_extensions/MHellmund/julia-color/resources/css/ansicolor.css
similarity index 94%
rename from _extensions/julia/resources/css/ansicolor.css
rename to _extensions/MHellmund/julia-color/resources/css/ansicolor.css
index 9aea6a7..b8c5cf1 100644
--- a/_extensions/julia/resources/css/ansicolor.css
+++ b/_extensions/MHellmund/julia-color/resources/css/ansicolor.css
@@ -1,7 +1,6 @@
 /* CSS added by ANSI escape sequences filter */
 
 .ansi {
-   /* line-height:1.15; */
     overflow:auto;
 }
 
@@ -46,5 +45,8 @@ pre .ansi-cyan-intense-bg { background-color: #258f8f; }
 pre .ansi-white-intense-bg { background-color: #a1a6b2; }
 pre .ansi-default-inverse-fg { color: rgba(255, 255, 255, 1); }
 pre .ansi-default-inverse-bg { background-color: #111111; }
-pre .ansi-bold { font-weight: bold; }
+pre .ansi-bold { font-weight: 800; }
+pre .ansi-light { font-weight: 300; }
+pre .ansi-italic { font-style: italic; }
 pre .ansi-underline { text-decoration: underline; }
+
diff --git a/_extensions/MHellmund/julia-color/resources/css/juliamono.css b/_extensions/MHellmund/julia-color/resources/css/juliamono.css
new file mode 100644
index 0000000..b3f461c
--- /dev/null
+++ b/_extensions/MHellmund/julia-color/resources/css/juliamono.css
@@ -0,0 +1,110 @@
+@font-face {
+    font-family: JuliaMono;
+    font-weight: 300;
+    font-style: normal;
+    src: url("../fonts/JuliaMono-Light.woff2") format("woff2");
+    text-rendering: optimizeLegibility;
+}
+
+@font-face {
+    font-family: JuliaMono;
+    font-weight: 400;
+    font-style: normal;
+    src: url("../fonts/JuliaMono-Regular.woff2") format("woff2");
+    text-rendering: optimizeLegibility;
+}
+
+@font-face {
+    font-family: JuliaMono;
+    font-weight: 500;
+    font-style: normal;
+    src: url("../fonts/JuliaMono-Medium.woff2") format("woff2");
+    text-rendering: optimizeLegibility;
+}
+
+@font-face {
+    font-family: JuliaMono;
+    font-weight: 600;
+    font-style: normal;
+    src: url("../fonts/JuliaMono-SemiBold.woff2") format("woff2");
+    text-rendering: optimizeLegibility;
+}
+
+@font-face {
+    font-family: JuliaMono;
+    font-weight: 700;
+    font-style: normal;
+    src: url("../fonts/JuliaMono-Bold.woff2") format("woff2");
+    text-rendering: optimizeLegibility;
+}
+
+@font-face {
+    font-family: JuliaMono;
+    font-weight: 800;
+    font-style: normal;
+    src: url("../fonts/JuliaMono-ExtraBold.woff2") format("woff2");
+    text-rendering: optimizeLegibility;
+}
+
+@font-face {
+    font-family: JuliaMono;
+    font-weight: 900;
+    font-style: normal;
+    src: url("../fonts/JuliaMono-Black.woff2") format("woff2");
+    text-rendering: optimizeLegibility;
+}
+@font-face {
+    font-family: JuliaMono;
+    font-weight: 300;
+    font-style: italic;
+    src: url("../fonts/JuliaMono-LightItalic.woff2") format("woff2");
+    text-rendering: optimizeLegibility;
+}
+
+@font-face {
+    font-family: JuliaMono;
+    font-weight: 400;
+    font-style: italic;
+    src: url("../fonts/JuliaMono-RegularItalic.woff2") format("woff2");
+    text-rendering: optimizeLegibility;
+}
+
+@font-face {
+    font-family: JuliaMono;
+    font-weight: 500;
+    font-style: italic;
+    src: url("../fonts/JuliaMono-MediumItalic.woff2") format("woff2");
+    text-rendering: optimizeLegibility;
+}
+
+@font-face {
+    font-family: JuliaMono;
+    font-weight: 600;
+    font-style: italic;
+    src: url("../fonts/JuliaMono-SemiBoldItalic.woff2") format("woff2");
+    text-rendering: optimizeLegibility;
+}
+
+@font-face {
+    font-family: JuliaMono;
+    font-weight: 700;
+    font-style: italic;
+    src: url("../fonts/JuliaMono-BoldItalic.woff2") format("woff2");
+    text-rendering: optimizeLegibility;
+}
+
+@font-face {
+    font-family: JuliaMono;
+    font-weight: 800;
+    font-style: italic;
+    src: url("../fonts/JuliaMono-ExtraBoldItalic.woff2") format("woff2");
+    text-rendering: optimizeLegibility;
+}
+
+@font-face {
+    font-family: JuliaMono;
+    font-weight: 900;
+    font-style: italic;
+    src: url("../fonts/JuliaMono-BlackItalic.woff2") format("woff2");
+    text-rendering: optimizeLegibility;
+}
diff --git a/_extensions/MHellmund/julia-color/resources/fonts/JuliaMono-Black.woff2 b/_extensions/MHellmund/julia-color/resources/fonts/JuliaMono-Black.woff2
new file mode 100644
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new file mode 100644
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diff --git a/_extensions/MHellmund/julia-color/resources/fonts/JuliaMono-Light.woff2 b/_extensions/MHellmund/julia-color/resources/fonts/JuliaMono-Light.woff2
new file mode 100644
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new file mode 100644
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new file mode 100644
index 0000000..761ce8d
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diff --git a/_extensions/MHellmund/julia-color/resources/fonts/JuliaMono-Regular.woff2 b/_extensions/MHellmund/julia-color/resources/fonts/JuliaMono-Regular.woff2
new file mode 100644
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new file mode 100644
index 0000000..2a79061
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diff --git a/_extensions/MHellmund/julia-color/resources/fonts/JuliaMono-SemiBold.woff2 b/_extensions/MHellmund/julia-color/resources/fonts/JuliaMono-SemiBold.woff2
new file mode 100644
index 0000000..b11a229
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diff --git a/_extensions/MHellmund/julia-color/resources/fonts/JuliaMono-SemiBoldItalic.woff2 b/_extensions/MHellmund/julia-color/resources/fonts/JuliaMono-SemiBoldItalic.woff2
new file mode 100644
index 0000000..3638f74
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diff --git a/_extensions/julia/resources/fonts/LICENSE b/_extensions/MHellmund/julia-color/resources/fonts/LICENSE
similarity index 100%
rename from _extensions/julia/resources/fonts/LICENSE
rename to _extensions/MHellmund/julia-color/resources/fonts/LICENSE
diff --git a/_extensions/julia/resources/juliainc.tex b/_extensions/MHellmund/julia-color/resources/tex/juliainc.tex
similarity index 84%
rename from _extensions/julia/resources/juliainc.tex
rename to _extensions/MHellmund/julia-color/resources/tex/juliainc.tex
index 836ef19..8a7e193 100644
--- a/_extensions/julia/resources/juliainc.tex
+++ b/_extensions/MHellmund/julia-color/resources/tex/juliainc.tex
@@ -8,9 +8,15 @@
   BoldFont = *-Bold,
   ItalicFont = *-RegularItalic,
   BoldItalicFont = *-BoldItalic,
+  FontFace={l}{n}{Font=*-Light},
+  FontFace={l}{it}{Font=*-LightItalic},
   Contextuals = AlternateOff,
 ]
 
+\DeclareRobustCommand{\lseries}{\fontseries{l}\selectfont}
+\DeclareTextFontCommand{\textlight}{\lseries}
+
+
 \DefineVerbatimEnvironment{OutputCell}{Verbatim}%
   {xleftmargin=1.5em}
 \DefineVerbatimEnvironment{AnsiOutputCell}{Verbatim}%
@@ -35,4 +41,4 @@
 \definecolor{ansi-white}{HTML}{C5C1B4}
 \definecolor{ansi-white-intense}{HTML}{A1A6B2}
 \definecolor{ansi-default-inverse-fg}{HTML}{FFFFFF}
-\definecolor{ansi-default-inverse-bg}{HTML}{000000}
\ No newline at end of file
+\definecolor{ansi-default-inverse-bg}{HTML}{000000}
diff --git a/_extensions/julia/_extension.yml b/_extensions/julia/_extension.yml
deleted file mode 100644
index 300fb3c..0000000
--- a/_extensions/julia/_extension.yml
+++ /dev/null
@@ -1,15 +0,0 @@
-title: Extensions for Julia
-author: Meik Hellmund
-version: 0.3.0
-contributes:
-  format:
-    common:
-      filters:
-        - ansi2htmltex.lua
-      ipynb-filters:
-        - escfilter.py  
-    pdf:
-      default
-
-    html:
-      monofont: "JuliaMono"
diff --git a/_extensions/julia/escfilter.py b/_extensions/julia/escfilter.py
deleted file mode 100755
index 76e80c4..0000000
--- a/_extensions/julia/escfilter.py
+++ /dev/null
@@ -1,5 +0,0 @@
-import sys
-f = sys.stdin.read()
-g = f.replace('\\u001b[','ꍟ⦃').replace('\\u001b]8;;','').replace('\\u001b\\\\','')
-sys.stdout.write(g)
-
diff --git a/_extensions/julia/resources/css/juliamono.css b/_extensions/julia/resources/css/juliamono.css
deleted file mode 100644
index 219ad67..0000000
--- a/_extensions/julia/resources/css/juliamono.css
+++ /dev/null
@@ -1,55 +0,0 @@
-@font-face {
-    font-family: JuliaMono;
-    font-weight: 300;
-    font-style: normal;
-    src: url("../fonts/JuliaMono-Light.woff2") format("woff2");
-    text-rendering: optimizeLegibility;
-}
-
-@font-face {
-    font-family: JuliaMono;
-    font-weight: 400;
-    font-style: normal;
-    src: url("../fonts/JuliaMono-Regular.woff2") format("woff2");
-    text-rendering: optimizeLegibility;
-}
-
-@font-face {
-    font-family: JuliaMono;
-    font-weight: 500;
-    font-style: normal;
-    src: url("../fonts/JuliaMono-Medium.woff2") format("woff2");
-    text-rendering: optimizeLegibility;
-}
-
-@font-face {
-    font-family: JuliaMono;
-    font-weight: 600;
-    font-style: normal;
-    src: url("../fonts/JuliaMono-SemiBold.woff2") format("woff2");
-    text-rendering: optimizeLegibility;
-}
-
-@font-face {
-    font-family: JuliaMono;
-    font-weight: 700;
-    font-style: normal;
-    src: url("../fonts/JuliaMono-Bold.woff2") format("woff2");
-    text-rendering: optimizeLegibility;
-}
-
-@font-face {
-    font-family: JuliaMono;
-    font-weight: 800;
-    font-style: normal;
-    src: url("../fonts/JuliaMono-ExtraBold.woff2") format("woff2");
-    text-rendering: optimizeLegibility;
-}
-
-@font-face {
-    font-family: JuliaMono;
-    font-weight: 900;
-    font-style: normal;
-    src: url("../fonts/JuliaMono-Black.woff2") format("woff2");
-    text-rendering: optimizeLegibility;
-}
diff --git a/_extensions/julia/resources/fonts/JuliaMono-Black.woff2 b/_extensions/julia/resources/fonts/JuliaMono-Black.woff2
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diff --git a/_extensions/julia/resources/fonts/JuliaMono-SemiBold.woff2 b/_extensions/julia/resources/fonts/JuliaMono-SemiBold.woff2
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diff --git a/_quarto.yml b/_quarto.yml
index 349d0f1..2493df5 100644
--- a/_quarto.yml
+++ b/_quarto.yml
@@ -42,20 +42,22 @@ book:
   chapters:
     - index.qmd
     - chapters/entwicklungsumgebungen.qmd
-    - chapters/first_contact.qmd
-    - chapters/Erste_Bsp.qmd
+  #  - chapters/first_contact.qmd
+  #  - chapters/Erste_Bsp.qmd
     - chapters/syntax.qmd
     - chapters/5_TricksHelp.qmd
     - chapters/numerictypes.qmd
     - chapters/Pi2.qmd
-    - chapters/types.qmd
-    - chapters/pcomplex.qmd
-    - chapters/9_functs.qmd
+  #  - chapters/types.qmd
+  #  - chapters/pcomplex.qmd
+  #  - chapters/9_functs.qmd
     - chapters/6_ArraysEtcP1.qmd
-    - chapters/7_ArraysP2.qmd
-    - chapters/11_LinAlg.qmd
-    - chapters/10_Strings.qmd
-    - chapters/14_Plot.qmd
+  #  - chapters/7_ArraysP2.qmd
+  #  - chapters/11_LinAlg.qmd
+  #  - chapters/10_Strings.qmd
+  #  - chapters/14_Plot.qmd
+  #  - chapters/13_IO.qmd
+  
   #  - chapters/makie.qmd
   #  - chapters/ablaufsteuerung.qmd
   #  - chapters/example.qmd
@@ -64,7 +66,7 @@ book:
 
 
 format:
-  julia-html:
+  julia-color-html:
     theme:
       light: [cosmo,     css/light.scss] 
       dark:  [superhero, css/dark.scss]
@@ -84,9 +86,9 @@ format:
       body-width:	1150px # 800
       margin-width:	250px
       gutter-width: 1.5em
-    cap-location: bottom 
+    cap-location: bottom
 
-  julia-pdf:
+  julia-color-pdf:
     pdf-engine: xelatex
     papersize: a4
     documentclass: scrreprt
@@ -120,6 +122,7 @@ execute:
   eval: true
   freeze: auto
   daemon: 3600
+  preserve-ansi: true
 
 keep-ipynb: true
 keep-tex: true
diff --git a/chapters/13_IO.qmd b/chapters/13_IO.qmd
new file mode 100644
index 0000000..1d8760e
--- /dev/null
+++ b/chapters/13_IO.qmd
@@ -0,0 +1,414 @@
+# Ein- und Ausgabe I/O
+
+zahlreiche Varianten und Funktionen, das Folgende ist eine kleine Auswahl
+
+## Konsole
+
+- OS-abhängig; üblicherweise 3 Kanäle _(streams)_: `stdin, stdout, stderr`  (Standardinput, -output, -errorkanal)
+
+
+
+- Schreiben nach `stdout`: `print()`,`println()`,`printstyled()`
+- Schreiben nach `stderr`:  `print(strerr,...)`, `println(stderr,...)`, `printstyled(stderr,...)`
+- Lesen von `stdin`: `readline()`
+
+### Umwandeln von Strings in andere Typen:
+  
+  - `chomp()` entfernt newline
+  - `split()` zerlegt in "Wörter" 
+  - `parse()` wandelt in andere Typen um
+
+### Buffer
+
+- `write`-Zugriffe werden gebuffert.
+  
+  - `flush(stdout)`   leert Buffer
+
+
+```julia
+# aus dem ersten Beispielprogramm
+
+function input(prompt = "Eingabe:")
+    println(prompt)
+    flush(stdout)
+    return chomp(readline())
+end
+
+```
+
+
+```julia
+a = input("Bitte 2 Zahlen eingeben!")
+```
+
+
+```julia
+av = split(a)
+```
+
+
+```julia
+parse.(Int, av)
+```
+
+
+```{julia}
+# Ausgaben auf den Fehlerkanal stderr erscheinen im Jupyter in rot:
+@warn "Das @warn-Macro schreibt nach stderr."
+println("Hallo!")
+println(stderr, "Das sollte nicht passieren!")    
+```
+
+### Einzelne Tastenanschläge einlesen
+
+- `readline()` u.ä. warten auf den Abschluss der Eingabe durch Drücken der `Enter`-Taste. 
+- Zum Einlesen einzelner _keystrokes_:
+  
+  - [https://stackoverflow.com/questions/56888266/how-to-read-keyboard-inputs-at-every-keystroke-in-julia](https://stackoverflow.com/questions/56888266/how-to-read-keyboard-inputs-at-every-keystroke-in-julia)
+  - [https://stackoverflow.com/questions/60954235/how-can-i-test-whether-stdin-has-input-available-in-julia](https://stackoverflow.com/questions/60954235/how-can-i-test-whether-stdin-has-input-available-in-julia)
+  
+
+## Formatierte Ausgabe mit dem `Printf`-Paket
+
+Die Macros `@sprintf` und `@printf` sind den gleichnamigen C-Funktionen nachempfunden
+
+- Formatstring: Normaler String mit Platzhaltern
+- Platzhalter haben die Form 
+```
+%[flags][width][.precision]type
+```
+   (wobei die Angaben in eckigen Klammern alle optional sind)
+- Typen: 
+```
+%s      string
+%i      integer
+%o      integer octal (base=8)
+%x, %X  integer hexadecimal (base=16) with digits 0-9abcdef  or 0-9ABCDEF, resp.
+%f      floatong point number
+%e      floating point number, scientific representation
+%g      floating point, uses %f or %e depending on value
+```
+
+- Flags:
+```
+Pluszeichen:    rechtsbündig (Standard)
+Minuszeichen:   linksbündig
+Null:           mit führenden Nullen
+```
+
+- Width: 
+```
+Anzahl der minimal verwendeten Zeichen (wenn nötig, werden auch mehr genommen)
+```
+
+
+Zeit für Beispiele:
+
+
+```julia
+using Printf    # Paket laden nicht vergessen!
+```
+
+
+```julia
+@printf("|%s|", "Hallo")     # string mit Platzhalter für String
+```
+
+
+```julia
+@printf("|%10s|", "Hallo")   # Minimallänge, rechtsbündig    
+```
+
+
+```julia
+@printf("|%-10s|", "Hallo")     # linksbündig
+```
+
+
+```julia
+@printf("|%3s|", "Hallo")     # Längenangabe kann überschritten werden 
+                              # besser eine 'kaputt formatierte' Tabelle als falsche Werte!!
+```
+
+
+```julia
+j = 123
+k = 90019001
+l = 3342678
+
+@printf("j= %012i, k= %-12i, l = %12i", j, k, l)   #  0-Flag für führende Nullen
+```
+
+`@printf` und `@sprintf` können wie alle Macros wie Funktionen aufgerufen werden:
+
+
+```julia
+@printf("%i %i", 22, j)
+```
+
+-- oder wie Macros, also ohne Funktionsklammern und ohne Komma:
+
+
+```julia
+@printf "%i %i" 22 j
+```
+
+`@printf` kann als erstes Argument noch einen stream übergeben bekommen. 
+
+Ansonsten besteht die Argumentliste aus
+
+- Formatstring mit Platzhaltern
+- Variablen in der Reihenfolge der Platzhalter, in Anzahl und Typ zu den Platzhaltern passend
+
+
+```{julia}
+@printf(stderr, "Erstes Resultat: %i %s\nZweites Resultat %i", 
+                                   j, "(geschätzt)"       ,k)
+```
+
+`@sprintf` druckt nichts, sondern liefert den ausgefüllten formatierten String zurück: 
+
+
+```julia
+str = @sprintf("x = %10.6f", π );
+```
+
+
+```julia
+str
+```
+
+##### Formatierung der Gleitkommazahlen:
+
+Bedeutung des _Precision_-Wertes:
+
+- `%f` und  `%e`-Format:  max. Anzahl der Nachkommastellen
+- `%g`-Format:  max. Anzahl von ausgegebenen Ziffern (Vor- + Nachkommastellen) 
+
+
+```julia
+x = 123456.7890123456
+
+@printf("%20.4f   %20.4e", x, x)     # 4 Nachkommastellen
+```
+
+
+```julia
+@printf("%20.7f %20.7e", x, x)     # 7 Nachkommastellen
+```
+
+
+```julia
+@printf("%20.7g %20.4g", x, x)    # insgesamt 7 bzw. 4 Stellen
+```
+
+## Dateioperationen
+
+Dateien werden
+
+ - geöffnet ==>  Dabei ensteht ein neues _stream_-Objekt (zusätzlich zu `stdin, stdout, stderr`)
+ - dann kann dieser _stream_ gelesen und geschrieben werden
+ - geschlossen ==> _stream_-Objekt wird von Datei getrennt
+ 
+ ```
+ stream = open(path, mode)
+ ```
+ 
+ - path: Dateiname/pfad
+ - mode: 
+ ```
+ "r"    read, öffnet am Dateianfang
+ "w"    write, öffnet am Dateianfang (Datei wird neu angelegt oder überschrieben)
+ "a"    append, öffnet zum Weiterschreiben am Dateiende
+ ```  
+
+
+```julia
+f = open("datei.txt", "w")
+```
+
+
+```julia
+@printf(f, "%20i\n", k)
+```
+
+
+```julia
+println(f, " zweite Zeile")
+```
+
+
+```julia
+close(f)
+```
+
+
+```julia
+;cat datei.txt
+```
+
+
+```julia
+f = open("datei.txt", "r")
+```
+
+
+```julia
+n = 0
+for i in readlines(f)    # Lese zeilenweise
+    n += 1
+    println(n, i)       # Drucke mit Zeilennummer
+end
+```
+
+## Pakete für Dateiformate
+
+Pakete für die Ein- und Ausgabe in den verschiedensten Dateiformaten 
+
+- [PrettyTables.jl](https://ronisbr.github.io/PrettyTables.jl/stable/) Ausgabe von formatierten Tabellen
+- [DelimitedFiles.jl](https://docs.julialang.org/en/v1/stdlib/DelimitedFiles/) Ein- und Ausgabe von Matrizen u.ä.
+- [CSV.jl](https://csv.juliadata.org/stable/) Ein- und Ausgabe von Dateien mit "comma-delimited values" u.ä.
+- [XLSX.jl](https://felipenoris.github.io/XLSX.jl/stable/tutorial/) Ein- und Ausgabe von Excel-Dateien
+
+und viele andere mehr...
+
+### Delimited Files
+
+
+
+```julia
+using DelimitedFiles
+```
+
+
+```julia
+A = rand(200,3)
+```
+
+
+```julia
+f = open("data2.txt", "w")
+```
+
+
+```julia
+writedlm(f, A)
+```
+
+
+```julia
+close(f)
+```
+
+
+```julia
+;head data2.txt
+```
+
+
+```julia
+B = readdlm("data2.txt")
+
+```
+
+
+```julia
+# man kann open() auch als 1.Argument eine function(iostream) übergeben, die auf den stream 
+# angewendet wird, wonach der stream automatisch geschlosssen wird.  
+#
+# Mit der do-Notation sieht obiger code so aus:
+
+open("data2.txt", "w") do io
+    writedlm(io, A)
+end
+
+```
+
+### CSV und DataFrames
+
+- [DataFrames.jl](https://dataframes.juliadata.org/stable/) ist ein Paket zum bequemen Umgang mit tabellarischen Daten
+
+
+
+
+```julia
+using CSV, DataFrames, Downloads
+```
+
+
+```julia
+# Wetterdaten von Westerland, s. https://dev.meteostat.net/bulk/hourly.html
+
+
+url = "https://bulk.meteostat.net/v2/hourly/10018.csv.gz"
+```
+
+
+```julia
+http_response = Downloads.download(url)
+```
+
+
+```julia
+file = CSV.File(http_response, header=false)
+```
+
+
+```julia
+# https://dev.meteostat.net/bulk/hourly.html#endpoints
+
+# Spalte 1  Datum
+#        2  Uhrzeit (Stunde)
+#        3  Temp
+#        5  Luftfeuchtigkeit
+#        6  Niederschlag
+#        8 Windrichtung
+#        9 Windstärke
+
+
+df =  DataFrame(file)
+```
+
+
+```julia
+describe(df)
+```
+
+
+```julia
+using StatsPlots
+```
+
+
+```julia
+using Dates
+```
+
+
+```julia
+# neue Spalte mit Sp.1 und 2  (date & time) kombiniert
+
+df[!, :datetime] = DateTime.(df.Column1) .+ Hour.(df.Column2);   
+```
+
+
+```julia
+describe(df)
+```
+
+
+```julia
+@df df plot(:datetime, :Column3)
+```
+
+
+```julia
+@df df plot(:datetime, [:Column9, :Column6, :Column3], 
+            xlims = (DateTime(2022,1,1), DateTime(2022,7,1)), 
+            layout=(3,1), title=["Wind" "Regen" "Temp"], legend=:none)
+```
+
+
+```julia
+
+```
diff --git a/chapters/6_ArraysEtcP1.qmd b/chapters/6_ArraysEtcP1.qmd
index bb56672..c63df71 100644
--- a/chapters/6_ArraysEtcP1.qmd
+++ b/chapters/6_ArraysEtcP1.qmd
@@ -1,5 +1,8 @@
-# Container
+---
+engine: julia
+---
 
+# Container
 
 Julia bietet eine große Auswahl von Containertypen mit weitgehend ähnlichem Interface an. 
 Wir stellen hier `Tuple`, `Range` und `Dict` vor, im nächsten Kapitel dann  `Array`, `Vector` und `Matrix`. 
diff --git a/chapters/Pi2.qmd b/chapters/Pi2.qmd
index f324b29..789b91e 100644
--- a/chapters/Pi2.qmd
+++ b/chapters/Pi2.qmd
@@ -1,18 +1,11 @@
 ---
-format:
-  html:
-    include-in-header:
-      text: |
-        <script type="application/javascript">
-        window.PlotlyConfig = {MathJaxConfig: 'local'}
-        </script>
+engine: julia
 ---
 
 # Ein Beispiel zur  Stabilität von Gleitkommaarithmetik
 
-## Berechnung von $\pi$ nach Archimedes
 
-```{julia}
+```julia
 #| error: false
 #| echo: false
 #| output: false
@@ -24,44 +17,25 @@ using Base64
 
 ## see https://github.com/JuliaPlots/PlotlyJS.jl/blob/master/src/PlotlyJS.jl
 ## https://discourse.julialang.org/t/encode-a-plot-to-base64/27765/3
-function IJulia.display_dict(p::PlotlyJS.SyncPlot)
-            Dict(
-             #   "application/vnd.plotly.v1+json" => JSON.lower(p),
-             #   "text/plain" => sprint(show, "text/plain", p),
-                "text/html" => let
-                    buf = IOBuffer()
-                    show(buf, MIME("text/html"), p)
-                    #close(buf)
-                    #String(resize!(buf.data, buf.size))
-                    String(take!(buf))
-                end,
-                   "image/png" => let
-                    buf = IOBuffer()
-                    buf64 = Base64EncodePipe(buf)
-                    show(buf64, MIME("image/png"), p)
-                    close(buf64)
-                    #String(resize!(buf.data, buf.size))
-                    String(take!(buf))
-                end,
 
-            )
-        end
-
-   function Base.show(io::IO, mimetype::MIME"text/html", p::PlotlyJS.SyncPlot)
-        uuid = string(UUIDs.uuid4())
-        show(io,mimetype,@htl("""
-    <div style="height: auto" id=\"$(uuid)\"></div>
-    <script>
-          require(['../js/plotly-latest.min.js'], function(plotly) {        
+function Base.show(io::IO, mimetype::MIME"text/html", p::PlotlyJS.SyncPlot)
+    uuid = string(UUIDs.uuid4())
+    show(io,mimetype,@htl("""
+        <div style="height: auto" id=\"$(uuid)\"></div>
+        <script>
+          require(['../js/plotly-latest.min.js'], function(plotly) {
             plotly.newPlot($(uuid),
             $(HypertextLiteral.JavaScript(json(p.plot.data))),
             $(HypertextLiteral.JavaScript(json(p.plot.layout))),{responsive: true});
             });
         </script>
-"""))
+    """))
 end 
 ```
 
+
+## Berechnung von $\pi$ nach Archimedes
+
 Eine untere Schranke für $2\pi$, den Umfang des Einheitskreises, erhält man durch die
 Summe der Seitenlängen eines dem Einheitskreis eingeschriebenen regelmäßigen $n$-Ecks.
  Die Abbildung links zeigt, wie man beginnend mit einem Viereck der Seitenlänge $s_4=\sqrt{2}$ die Eckenzahl iterativ verdoppelt.
@@ -165,8 +139,7 @@ layout = Layout(xaxis_title="Iterationsschritte", yaxis_title="rel. Fehler",
 plot([scatter(x=is, y=ϵ_A, mode="markers+lines", name="Iteration A", yscale=:log10),   
       scatter(x=is, y=ϵ_B, mode="markers+lines", name="Iteration B", yscale=:log10)],
       layout) 
- 
-```
+ ```
 
 
 
diff --git a/chapters/numerictypes.qmd b/chapters/numerictypes.qmd
index aa84c03..cc12748 100644
--- a/chapters/numerictypes.qmd
+++ b/chapters/numerictypes.qmd
@@ -1,7 +1,9 @@
+---
+engine: julia
+---
+
 # Maschinenzahlen
 
-
-
 ```{julia}
 for x ∈ ( 3, 3.3e4,  Int16(20), Float32(3.3e4), UInt16(9) )
     @show x sizeof(x) typeof(x)
diff --git a/chapters/syntax.qmd b/chapters/syntax.qmd
index 9917a22..30477de 100644
--- a/chapters/syntax.qmd
+++ b/chapters/syntax.qmd
@@ -1,4 +1,6 @@
-
+---
+engine: julia
+---
 
 # Grundlagen der Syntax
 
@@ -52,6 +54,7 @@ x = log(10)
 - Im interaktiven Betrieb (REPL oder Notebook) unterdrückt ein Semikolon nach der letzten Anweisung die Ausgabe des Ergebnisses dieser Anweisung.
 
 :::{.callout-tip}
+
 ## Beispiel 
 
 Im interaktiven Betrieb wird der Wert der letzten Anweisung auch ohne explizites `print()` ausgegeben:
diff --git a/index.qmd b/index.qmd
index 8e35116..f521e9e 100644
--- a/index.qmd
+++ b/index.qmd
@@ -1,3 +1,6 @@
+---
+engine: julia
+---
 # Was ist Julia? {.unnumbered}
 
 
@@ -5,6 +8,16 @@ Julia ist eine noch recht junge für *scientific computing* konzipierte moderne
 
 Ein kleines Codebeispiel:
 
+```{julia}
+#| error: false
+#| echo: false
+#| output: false
+
+using CairoMakie
+CairoMakie.activate!(type = "png")
+set_theme!(size=(800, 180))
+```
+
 ```{julia}
 using CairoMakie
 a = [3, 7, 5, 3]
@@ -20,7 +33,6 @@ end
 f
 ```
 
-
 ## Geschichte {.unnumbered}
 
 -   2009 Beginn der Entwicklung am *Computer Science and Artificial