commit bash-20130301 snapshot

examples/scripts.v2/rename

@@ -0,0 +1,122 @@
+#! /bin/bash
+#
+# original from:
+# @(#) rename.ksh 1.1 94/05/10
+# 90/06/01 John DuBois (spcecdt@armory.com)
+# 91/02/25 Improved help info
+# 92/06/07 remove quotes from around shell pattern as required by new ksh
+# 94/05/10 Exit if no globbing chars given.
+#
+# conversion to bash v2 syntax by Chet Ramey
+
+phelp()
+{
+echo "$usage
+All files that match oldpattern will be renamed with the
+filename components that match the constant parts of oldpattern
+changed to the corresponding constant parts of newpattern.
+The components of the filename that match variable parts of
+oldpattern will be preserved.  Variable parts in oldpattern
+must occur in the same order in newpattern.  Variables parts
+can be '?' and '*'.
+Example: 
+rename \"/tmp/foo*.ba.?\" \"/tmp/new*x?\"
+All files in /tmp that match foo*.ba.? will have the \"foo\" part
+replaced by \"new\" and the \".ba.\" part replaced by \"x\"."
+}
+
+usage="usage: $name [-htv] oldpattern newpattern"
+name=${0##/}
+
+while getopts "htv" opt; do
+    case "$opt" in
+    t) tell=true;;
+    v) verbose=true;;
+    h) phelp; exit 0;;
+    *) echo "$name: $usage" 1>&2; exit 2;;
+    esac
+done
+shift $((OPTIND - 1))
+
+if [ $# -lt 2 ]; then
+    phelp
+    exit 2
+fi
+
+oldpat=$1
+newpat=$2
+
+set -- $1
+if [ ! -e "$1" ]; then
+    echo "$name: no files match $oldpat."
+    exit 1
+fi
+
+typeset -i i=1 j
+
+# Example oldpat: foo*.a
+# Example newpat: bar*.b
+
+# Examples given for first iteration (in the example, the only interation)
+while :; do
+    case "$oldpat" in
+    *[\*\?]*)	;;
+    *)		break;;
+    esac
+
+    # Get leftmost globbing pattern in oldpat
+    pat=${oldpat#*[\*\?]}	# pat=.a
+    pat=${oldpat%%"$pat"}	# pat=foo*
+    pat=${pat##*[!\?\*]}	# pat=*
+    # Find parts before & after pattern
+    oldpre[i]=${oldpat%%"$pat"*}	# oldpre[1]=foo
+    oldsuf[i]=${oldpat#*"$pat"}		# oldsuf[1]=.a
+    newpre[i]=${newpat%%"$pat"*}	# newpre[1]=bar
+    # Get rid of processed part of patterns
+    oldpat=${oldpat#${oldpre[i]}"$pat"}	# oldpat=.a
+    newpat=${newpat#${newpre[i]}"$pat"}	# newpat=.b
+    let i=i+1
+done
+
+if [ $i -eq 1 ]; then
+    echo "No globbing chars in pattern." 1>&2
+    exit 1
+fi
+
+oldpre[i]=${oldpat%%"$pat"*}	# oldpre[2]=.a
+oldsuf[i]=${oldpat#*"$pat"}	# oldsuf[2]=.a
+newpre[i]=${newpat%%"$pat"*}	# newpre[2]=.b
+
+if [ -n "$verbose" ]; then
+    j=1
+    while let "j < i"; do
+	echo \
+"Old prefix: ${oldpre[j]}   Old suffix: ${oldsuf[j]}   New prefix: ${newpre[j]}"
+	let j=j+1
+    done
+fi
+
+# Example file: foox.a
+
+for file; do
+    j=1
+    origname=$file	# origname=foox.a
+    newfile=
+    while let "j <= i"; do
+	# Peel off a prefix	interation	1		2
+	file=${file#${oldpre[j]}}		# file=x.a	file=
+	# Save the part of this prefix that is to be retained
+	const=${file%${oldsuf[j]}}		# const=x	const=
+	newfile=$newfile${newpre[j]}$const	# newfile=barx	newfile=barx.b
+	file=${file#$const}			# file=.a	file=.a
+	let j=j+1
+    done
+    if [ -n "$tell" ]; then
+	echo "Would move \"$origname\" to \"$newfile\"."
+    else
+	if [ -n "$verbose" ]; then
+	    echo "Moving \"$origname\" to \"$newfile\"."
+	fi
+	mv $origname $newfile
+    fi
+done