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54 lines
961 B
Bash
Executable File
54 lines
961 B
Bash
Executable File
#!/bin/sh -e
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# Modified from Debian's add-shell to work on OS X
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if test $# -eq 0
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then
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echo usage: $0 shellname [shellname ...]
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exit 1
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fi
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scriptname=`basename "$0"`
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if [[ $UID -ne 0 ]]; then
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echo "${scriptname} must be run as root"
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exit 1
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fi
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file=/etc/shells
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# I want this to be GUARANTEED to be on the same filesystem as $file
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tmpfile=${file}.tmp
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set -o noclobber
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trap "rm -f $tmpfile" EXIT
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if ! cat $file > $tmpfile
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then
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cat 1>&2 <<EOF
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Either another instance of $0 is running, or it was previously interrupted.
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Please examine ${tmpfile} to see if it should be moved onto ${file}.
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EOF
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exit 1
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fi
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# Append a newline if it doesn't exist
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if [ "$(tail -c1 "$tmpfile"; echo x)" != $'\nx' ]; then
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echo "" >> "$tmpfile"
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fi
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for i
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do
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if ! grep -q "^${i}$" "$tmpfile"
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then
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echo $i >> "$tmpfile"
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fi
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done
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chmod 0644 $tmpfile
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chown root:wheel $tmpfile
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mv $tmpfile $file
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trap "" EXIT
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exit 0
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