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#!/bin/sh -e
if test $# -eq 0
then
echo usage: $0 shellname '[shellname ...]' 1>&2
exit 1
fi
file=/etc/shells
# I want this to be GUARANTEED to be on the same filesystem as $file
tmpfile=${file}.tmp
otmpfile=${file}.tmp2
set -o noclobber
trap "rm -f $tmpfile $otmpfile" EXIT
if ! cat $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 ${file}.
EOF
exit 1
fi
# this is supposed to be reliable, not pretty
for i
do
REALDIR="$(dirname $(realpath -m $i))/$(basename $i)"
for j in "$i" "$REALDIR"
do
grep -v "^${j}$" $tmpfile > $otmpfile || true
mv $otmpfile $tmpfile
done
done
chmod --reference=$file $tmpfile
chown --reference=$file $tmpfile
mv $tmpfile $file
trap "" EXIT
exit 0