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/usr/bin/cpif is in noweb 2.11b-7ubuntu1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

# cpif [ -eq -ne ] file...
# copy standard input to each of the named files
# if new * old is true or old doesn't exist;
# * defaults to -ne

PATH=/bin:/usr/bin

# set -x
op=-ne
case "$1" in
-eq|-ne)	op=$1; shift ;;
-*)		echo 'Usage: '`basename $0`' [ -eq -ne ] file...' 1>&2; exit 2
esac
case $# in
0)		echo 'Usage: '`basename $0`' [ -eq -ne ] file...' 1>&2; exit 2
esac

new=$(tempfile)
trap 'rm -f $new; exit 1' 1 2 15	# clean up files

cat >$new
for i
do
	cmp -s $new $i
	case $op$? in
	-eq0|-ne1|*2)	cp $new $i || { rm -f $new; exit 1; }
	esac
done
rm -f $new