nc.sh
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	#!/bin/csh -f
	#
	# Usage: nc oldvar newvar filelist
	#

	if ( $#argv < 3 ) then
	echo "Usage: $0 oldvar newvar filelist"
	exit
	endif

	set oldvar = "$1";
	set newvar = "$2";
	shift; shift;

	echo Replace \""$oldvar"\" with \"$newvar\" '[yes/(no)]'
	set response = ( $< )
	if ( "$response" != "yes" ) then
	exit
	endif

	set savedir = ( nc-$$ )
	mkdir $savedir

	foreach curfile ( $* )

	echo Substituting \"$newvar\" for \""$oldvar"\" in file \"$curfile\".
	cp $curfile $savedir/${curfile:t}.before
	cat $savedir/${curfile:t}.before \| sed s/'$[^a-zA-Z_]$$'"$oldvar"'$/\1'$newvar'/g' > $curfile

	end
	#
	# cat $oldfile \| sed s/'$[^a-zA-Z]$$[Nn][Zz]$/\1Nr/' > $newfile
	#