Edit: /usr/sbin/remove-shell (1099B)
#!/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="${file}.tmp2"
set -o noclobber
cleanup() {
rm -f "$tmpfile" "$otmpfile"
}
trap cleanup EXIT
if ! cat "$file" > "$tmpfile"
then
cat 1>&2 <
"$otmpfile" || true
mv "$otmpfile" "$tmpfile"
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