58 lines
1,000 B
Bash
Executable file
58 lines
1,000 B
Bash
Executable file
#!/bin/ksh
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set -e
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PATH=/bin:/sbin:/usr/bin:/usr/sbin:$PATH
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GID=1000 # start search from
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show_usage () {
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echo "usage: $0 [-ov] [-g gid] group" >&2
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exit 1
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}
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while getopts 'g:ov' f; do
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case $f in
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g) gid="$OPTARG";;
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o) reuse=1;;
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v) ;; # ignored
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\?) show_usage;;
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esac
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done
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shift $(($OPTIND - 1))
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get_unassigned_gid (){
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awk -F: -v gid="$GID" '
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{ h [$3] = 0 }
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END {while (gid in h){++gid}; print gid}' /etc/group
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}
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uniq_gid (){
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if ! awk -F: -v gid="$1" '$3 == gid {exit 1}' /etc/group; then
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echo "Can't add group: gid $1 is a duplicate" 1>&2
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exit 1
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fi
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}
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uniq_name (){
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if ! awk -F: -v name="$1" '$1 == name {exit 1}' /etc/group; then
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echo "Can't add group: $1 is a duplicate" 1>&2
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exit 1
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fi
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}
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if test $# -ne 1; then
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show_usage
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fi
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uniq_name "$1"
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if test -z "$gid"; then
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gid=`get_unassigned_gid`
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elif test -z "$reuse"; then
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uniq_gid "$gid"
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fi
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cp -p /etc/group /etc/group.tmp
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echo "$1:*:$gid:" >> /etc/group.tmp
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mv /etc/group.tmp /etc/group
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