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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 ! 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 ${file}.
- EOF
- exit 1
- fi
- for i
- do
- if ! grep -q "^${i}$" $tmpfile
- then
- echo $i >> $tmpfile
- fi
- done
- chmod --reference=$file $tmpfile
- chown --reference=$file $tmpfile
- mv $tmpfile $file
- trap "" EXIT
- exit 0
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