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View File Name : remove-shell

#!/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