5 WIP

beispiele/4/rename-jpg.sh

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+#!/bin/bash
+suf=$1
+if [ $# -gt 0 ]
+	then
+		for f in *.$suf; do
+		    bn=`basename "$f" .$suf |  sed 's/IMG_//'`
+			new=$bn.$suf
+			echo "neuer Dateiname:"
+			echo $new
+			mv "$f" $new
+		done
+	else
+		echo "Kein Suffix gegeben!!"
+		echo "Verwendung: strip-space.sh SUFFIX"
+		echo "Beende ...."
+		exit 1
+fi

beispiele/5/01-vars.sh

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+#!/bin/bash
+ 
+x=10            #NOT x = 10 no spaces
+X=20            #variables are case sensitive
+$y=             #NULL variable
+echo "x = $x"
+echo "X = $X"
+echo "y = $y"

beispiele/5/02-comments.sh

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+#!/bin/bash
+# This line is a comment.
+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.

beispiele/5/recursive-func.sh

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+#!/bin/bash
+
+# Beispiel für Rekursive Funktion
+
+#Funktions-Definition
+function sum() {
+    if [ -z "$2" ]; then
+
+        #Rückgabewert
+        echo $1
+
+    else
+        a=$1;
+        
+        #Parameter werden nach links verschoben : orkus  <- $1 , $1 <- $2 
+        shift;
+        
+        #Funktion ruft sich selbst auf - Rekursion
+        #Ergebnis. b == 2
+        b=`sum $@`
+
+
+        echo `expr $a + $b` # <- 1 + 2 
+    fi
+}
+
+# Funktions-Aufruf mit 2 Parametern
+sum 1 2

beispiele/5/while-menu.sh

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+# Script to create simple menus and take action according to that selected
+# menu item
+#
+while :
+ do
+    clear
+    echo "-------------------------------------"
+    echo " Main Menu "
+    echo "-------------------------------------"
+    echo "[1] Show Todays date/time"
+    echo "[2] Show files in current directory"
+    echo "[3] Show calendar"
+    echo "[4] Start editor to write letters"
+    echo "[5] Exit/Stop"
+    echo "======================="
+    echo -n "Enter your menu choice [1-5]: "
+    read yourch
+    case $yourch in
+      1) echo "Today is `date` , press a key. . ." ; read ;;
+      2) echo "Files in `pwd`" ; ls -l ; echo "Press a key. . ." ; read ;;
+      3) cal ; echo "Press a key. . ." ; read ;;
+      4) vi ;;
+      5) exit 0 ;;
+      *) echo "Opps!!! Please select choice 1,2,3,4, or 5";
+         echo "Press a key. . ." ; read ;;
+ esac
+done