122 lines
2.7 KiB
Bash
122 lines
2.7 KiB
Bash
#!/bin/sh
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#
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# adduser 1.0 - add a new user to the system Author: Kees J. Bot
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# 16 Jan 1996
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# Check arguments.
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case "$#" in
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3) user="$1"; group="$2"; home="$3"
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;;
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*) echo "Usage: adduser user group home-dir" >&2; exit 1
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esac
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# We need to be root.
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case "`id`" in
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'uid=0('*)
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;;
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*) echo "adduser: you must be root to add users" >&2; exit 1
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esac
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# User and group names must be alphanumeric and no longer than 8 characters.
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len=`expr "$user" : '[a-z][a-z0-9]*$'`
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if [ "$len" -eq 0 -o "$len" -gt 8 ]
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then
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echo >&2 \
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"adduser: the user name must be alphanumeric and no longer than 8 characters"
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exit 1
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fi
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len=`expr "$group" : '[a-z][a-z0-9]*$'`
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if [ "$len" -eq 0 -o "$len" -gt 8 ]
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then
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echo >&2 \
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"adduser: the group name must be alphanumeric and no longer than 8 characters"
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exit 1
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fi
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# The new user name must not exist, but the group must exist.
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if grep "^$user:" /etc/passwd >/dev/null
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then
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echo "adduser: user $user already exists" >&2
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exit 1
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fi
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gid=`sed -e "/^$group:/!d" -e 's/^[^:]*:[^:]*:\\([^:]*\\):.*/\\1/' /etc/group`
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if [ `expr "$gid" : '[0-9]*$'` -eq 0 ]
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then
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echo "adduser: group $group does not exist" >&2
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exit 1
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fi
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# Find the first free user-id of 10 or higher.
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uid=10
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while grep "^[^:]*:[^:]*:$uid:.*" /etc/passwd >/dev/null
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do
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uid=`expr $uid + 1`
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done
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# No interruptions.
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trap '' 1 2 3 15
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# Lock the password file.
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ln /etc/passwd /etc/ptmp || {
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echo "adduser: password file busy, try again later"
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exit 1
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}
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# Make the new home directory, it should not exist already.
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mkdir "$home" || {
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rm -rf /etc/ptmp
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exit 1
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}
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# Make the new home directory by copying the honorary home directory of our
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# fearless leader.
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echo cpdir /usr/ast "$home"
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cpdir /usr/ast "$home" || {
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rm -rf /etc/ptmp "$home"
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exit 1
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}
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# Change the ownership to the new user.
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echo chown -R $uid:$gid "$home"
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chown -R $uid:$group "$home" || {
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rm -rf /etc/ptmp "$home"
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exit 1
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}
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# Is there a shadow password file? If so add an entry.
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if [ -f /etc/shadow ]
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then
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echo "echo $user::0:0::: >>/etc/shadow"
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echo "$user::0:0:::" >>/etc/shadow || {
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rm -rf /etc/ptmp "$home"
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exit 1
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}
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pwd="##$user"
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else
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pwd=
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fi
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# Finish up by adding a password file entry.
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echo "echo $user:$pwd:$uid:$gid:$user:$home: >>/etc/passwd"
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echo "$user:$pwd:$uid:$gid:$user:$home:" >>/etc/passwd || {
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rm -rf /etc/ptmp "$home"
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exit 1
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}
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# Remove the lock.
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rm /etc/ptmp || exit
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echo "
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The new user $user has been added to the system. Note that the password,
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full name, and shell may be changed with the commands passwd(1), chfn(1),
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and chsh(1). The password is now empty, so only console logins are possible."
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if [ $gid = 0 ]
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then
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echo "\
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Also note that a new operator needs an executable search path (\$PATH) that
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does not contain the current directory (an empty field or "." in \$PATH)."
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fi
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exit 0
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