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|
#!/bin/sh
#
# Writen by Vandoorselaere Yoann <yoann@mandrakesoft.com>
# Thanks to Francis Galiegue.
#
file="group"
group_line=""
new_group_line=""
group_name=$2
user_name=$3
Usage() {
echo "Usage :"
echo " --add [ groupname ] [ username ] ---> Add an user to a group."
echo " --del [ groupname ] [ username ] ---> Delete an user from a group."
}
ModifyFile() {
mv /etc/${file} /tmp/${file}.old
head -$((group_line_number - 1)) /tmp/${file}.old > /etc/${file}
echo "${new_group_line}" >> /etc/${file}
tail +$((group_line_number + 1)) /tmp/${file}.old >> /etc/${file}
rm -f /tmp/${file}.old
}
RemoveUserFromGroup() {
new_group_line=${group}`echo ${group_users} |
sed -e s/,${user_name}$//g -e s/${user_name},//g -e s/${user_name}$//g`
}
AppendUserToGroup() {
if [[ -z ${group_users} ]]; then
new_group_line=${group_line}${user_name}
else
new_group_line=${group_line}",${user_name}"
fi
}
IsUserAlreadyInGroup() {
if echo ${group_users} | grep -qw "${user_name}"; then
return 1
fi
return 0
}
IsGroupExisting() {
group_line=""
group_line_number=""
# We get some group infos as well, will be used later
tmp=`grep -n "^${group_name}:" /etc/${file} | tr -d " "`
group_line_number=`echo ${tmp} | awk -F: '{print $1}'`
group=`echo ${tmp} | awk -F: '{print $2":"$3":"$4":"}'`
group_users=`echo ${tmp} | awk -F: '{print $5}'`
group_line=`echo ${tmp} | awk -F: '{print $2":"$3":"$4":"$5}'`
[ -z "${tmp}" ] && return 0
return 1
}
IsUserExisting() {
grep -qn "^${user_name}:" /etc/passwd
if [[ $? == 0 ]]; then
return 0;
fi
return 1;
}
Add() {
IsGroupExisting;
if [[ $? == 0 ]]; then
echo "Sorry, group \"${group_name}\" does not exist."
echo "Please create it using the \"groupadd\" command."
exit 1
fi
IsUserExisting;
if [[ $? == 1 ]]; then
echo "Sorry, user \"${user_name}\" does not exist."
exit 1
fi
IsUserAlreadyInGroup;
if [[ $? == 1 ]]; then
echo "Sorry, user \"${user_name}\" is already in group \"${group_name}\"."
exit 1
fi
AppendUserToGroup;
ModifyFile;
exit 0
}
Del() {
IsGroupExisting;
if [[ $? == 0 ]]; then
echo "Sorry, group \"${group_name}\" does not exist."
exit 1
fi
IsUserAlreadyInGroup;
if [[ $? == 0 ]]; then
echo "Sorry, user \"${user_name}\" is not in group \"${group_name}\"."
exit 1
fi
RemoveUserFromGroup;
ModifyFile;
exit 0
}
Perm() {
if [[ ! -w /etc/${file} ]]; then
echo "You're not allowed to write to /etc/group..."
exit 1
fi
}
if [[ $# == 3 ]]; then
case $1 in
"--add")
Perm;
Add;
exit 0
;;
"--del")
Perm;
Del;
exit 0
;;
esac
Usage;
exit 0
else
Usage;
fi
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