Data commit

Task/Substring/UNIX-Shell/substring-1.sh

@@ -0,0 +1,9 @@
+str="abc qrdef qrghi"
+n=6
+m=3
+
+expr "x$str" : "x.\{$n\}\(.\{1,$m\}\)"
+expr "x$str" : "x.\{$n\}\(.*\)"
+printf '%s\n' "${str%?}"
+expr "r${str#*r}" : "\(.\{1,$m\}\)"
+expr "qr${str#*qr}" : "\(.\{1,$m\}\)"

Task/Substring/UNIX-Shell/substring-2.sh

@@ -0,0 +1,17 @@
+str="abc qrdef qrghi"
+n=6
+m=3
+
+expr "x$str" : "x.\{$n\}\(.\{1,$m\}\)"
+expr "x$str" : "x.\{$n\}\(.*\)"
+expr "x$str" : "x\(.*\)."
+
+index() {
+	i=0 s=$1
+	until test "x$s" = x || expr "x$s" : "x$2" >/dev/null; do
+		i=`expr $i + 1` s=`expr "x$s" : "x.\(.*\)"`
+	done
+	echo $i
+}
+expr "x$str" : "x.\{`index "$str" r`\}\(.\{1,$m\}\)"
+expr "x$str" : "x.\{`index "$str" qr`\}\(.\{1,$m\}\)"

Task/Substring/UNIX-Shell/substring-3.sh

@@ -0,0 +1,8 @@
+#!/bin/zsh
+string='abcdefghijk'
+echo ${string:2:3}              # Display 3 chars starting 2 chars in ie: 'cde'
+echo ${string:2}                # Starting 2 chars in, display to end of string
+echo ${string:0:${#string}-1}   # Whole string minus last character
+echo ${string%?}                 # Shorter variant of the above
+echo ${${string/*c/c}:0:3}      # Display 3 chars starting with 'c'
+echo ${${string/*cde/cde}:0:3}  # Display 3 chars starting with 'cde'

Task/Substring/UNIX-Shell/substring-4.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+str=abcdefghijklmnopqrstuvwxyz
+n=12
+m=5
+
+printf %s "$str" | cut -c $n-`expr $n + $m - 1`
+printf %s "$str" | cut -c $n-
+printf '%s\n' "${str%?}"
+printf q%s "${str#*q}" | cut -c 1-$m
+printf pq%s "${str#*pq}" | cut -c 1-$m