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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
cleanup() {
rm -f "$tmpfile"
}
trap cleanup EXIT
if ! awk '{print}' "$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}" || chmod $(stat -c %a "${file}") "${tmpfile}"
chown --reference="${file}" "${tmpfile}" || chown $(stat -c %U "${file}") "${tmpfile}"
mv -Z "${tmpfile}" "${file}" || mv "${tmpfile}" "${file}"
trap "" EXIT
exit 0