linuxkurs/5.html

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<!doctype html>
<html lang="de">
<meta charset="utf-8">
<title>Einführung in Linux</title>
<meta name="description" content="YALC - Yet Another Linux Course ">
<meta name="author" content="Daniel Schubert">
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<h1>LINUX</h1>
<h3>Das universelle Betriebssystem</h3>
<p>Eine Einführung - Teil 5
<p>
<small>Deutsche Angestellten Akademie</small>
</p>
<aside class="notes">
Frage: Fragen zur letzten Stunde?
</aside>
</section>
<section>
<h2>Bash scripting - Fortsetzung</h2>
</section>
<section>
<h3>LINKS</h3>
<p>http://tldp.org/LDP/abs/html/complexfunct.html
<p>http://programmingexamples.wikidot.com/bash-scripting#toc24
<p>https://wiki.ubuntuusers.de/Shell/Bash-Skripting-Guide_für_Anfänger/#Quoting
<div>
- script kontrolle ( strg-z etc )
- input
- parameter
- functions
- kontrollstrukturen
-
</section>
<section>
<h3>Variablen</h3>
<pre><code>#!/bin/bash
x=10 #NICHT x = 10 -> keine Leerzeichen!
X=20 #variablen sind Case Sensitive
$y= #NULL variable
echo "x = $x"
echo "X = $X"
echo "y = $y"</code></pre>
</section>
<section>
<h3>Kommentare</h3>
<pre><code>
#!/bin/bash
# Diese Zeile ist ein Kommentar
echo "A comment will follow." # Comment here.
echo "The # here does not begin a comment."
echo 'The # here does not begin a comment.'
echo The \# here does not begin a comment.
echo The # here begins a comment.
echo ${PATH#*:} # Parameter substitution, not a comment.
echo $(( 2#101011 )) # Base conversion, not a comment.
</code>
</pre>
</section>
<section>
<h3>Quotes</h3>
<ul>
<li class="fragment ">Double Quotes: " " -Anything enclose in double quotes removed meaning of that characters (except \ and $).</li>
<li class="fragment ">Single quotes: ' ' - Enclosed in single quotes remains unchanged.</li>
<li class="fragment ">Back quote: ` ` - To execute command</li>
</ul>
</section>
<section>
<h3>Input - Output redirection</h3>
<ul>
<li class="fragment "> > : output in Datei. Best. Datei wird überschrieben!</li>
<li class="fragment "> >> : output an Datei anhängen.</li>
<li class="fragment "> < : Kommando Input aus Datei lesen</li>
</ul>
<pre><code>#!/bin/bash
echo "ls > file_list"
ls > file_list
echo "ls -la >> file_list"
ls -la >> file_list
echo "cat < file_list"
cat < file_list</code></pre>
</section>
<section>
- arithmetik
let "m = 4 * 1024";echo $m
let "m += 15"
let "m -= 3"
let "m /= 5"
let "m %= 10"
let "m++"
let "m--"
let "k = (m < 9) ? 0 : 1"
condition ? value-if-true : value-if-false
Floating Poin:
echo "32.0 + 1.4" | bc
echo `expr $m + 18`
m=`expr $m + 18`
(( m *= 4 ))
</section>
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</section>
<section>
<h3>Die 5 Level eines Vim Magiers</h3>
<ul>
<li>Level 0: nichts über vim wissen
<li>Level 1: vim basics kennen
<li>Level 2: den visual mode kennen
<li>Level 3: diverse „motions“ kennen
<li>Level 4: den visual mode nicht brauchen
</ul>
<p>https://danielmiessler.com/study/vim/
</section>
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