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#!/bin/sh -e if test $# -eq 0 then echo usage: $0 shellname [shellname ...] exit 1 fi file=/etc/shells # I want this to be GUARANTEED to be on the same filesystem as $file tmpfile=${file}.tmp set -o noclobber trap "rm -f $tmpfile" EXIT if ! awk '{print}' $file > $tmpfile then cat 1>&2 <<EOF Either another instance of $0 is running, or it was previously interrupted. Please examine ${tmpfile} to see if it should be moved onto ${file}. EOF exit 1 fi for i do REALDIR="$(dirname $(realpath -m $i))/$(basename $i)" for j in "$i" "$REALDIR" do if ! grep -q "^${j}$" $tmpfile then echo $j >> $tmpfile fi done done chmod --reference=$file $tmpfile chown --reference=$file $tmpfile mv $tmpfile $file trap "" EXIT exit 0