commands/scripts/adduser.sh

   1 #!/bin/sh
   2 #
   3 #       adduser 1.0 - add a new user to the system      Author: Kees J. Bot
   4 #                                                               16 Jan 1996
   5
   6 # Check arguments.
   7 case "$#" in
   8 3)      user="$1"; group="$2"; home="$3"
   9         ;;
  10 *)      echo "Usage: adduser user group home-dir" >&2; exit 1
  11 esac
  12
  13 # We need to be root.
  14 case "`id`" in
  15 'uid=0('*)
  16         ;;
  17 *)      echo "adduser: you must be root to add users" >&2; exit 1
  18 esac
  19
  20 # User and group names must be alphanumeric and no longer than 8 characters.
  21 len=`expr "$user" : '[a-z][a-z0-9]*$'`
  22 if [ "$len" -eq 0 -o "$len" -gt 8 ]
  23 then
  24         echo >&2 \
  25 "adduser: the user name must be alphanumeric and no longer than 8 characters"
  26         exit 1
  27 fi
  28
  29 len=`expr "$group" : '[a-z][a-z0-9]*$'`
  30 if [ "$len" -eq 0 -o "$len" -gt 8 ]
  31 then
  32         echo >&2 \
  33 "adduser: the group name must be alphanumeric and no longer than 8 characters"
  34         exit 1
  35 fi
  36
  37 # The new user name must not exist, but the group must exist.
  38 if grep "^$user:" /etc/passwd >/dev/null
  39 then
  40         echo "adduser: user $user already exists" >&2
  41         exit 1
  42 fi
  43
  44 gid=`sed -e "/^$group:/!d" -e 's/^[^:]*:[^:]*:\\([^:]*\\):.*/\\1/' /etc/group`
  45 if [ `expr "$gid" : '[0-9]*$'` -eq 0 ]
  46 then
  47         echo "adduser: group $group does not exist" >&2
  48         exit 1
  49 fi
  50
  51 # Find the first free user-id of 10 or higher.
  52 uid=10
  53 while grep "^[^:]*:[^:]*:$uid:.*" /etc/passwd >/dev/null
  54 do
  55         uid=`expr $uid + 1`
  56 done
  57
  58 # No interruptions.
  59 trap '' 1 2 3 15
  60
  61 # Lock the password file.
  62 ln /etc/passwd /etc/ptmp || {
  63         echo "adduser: password file busy, try again later"
  64         exit 1
  65 }
  66
  67 # Make the new home directory, it should not exist already.
  68 mkdir "$home" || {
  69         rm -rf /etc/ptmp
  70         exit 1
  71 }
  72
  73 # Make the new home directory by copying the honorary home directory of our
  74 # fearless leader.
  75 echo cpdir /usr/ast "$home"
  76 cpdir /usr/ast "$home" || {
  77         rm -rf /etc/ptmp "$home"
  78         exit 1
  79 }
  80
  81 # Change the ownership to the new user.
  82 echo chown -R $uid:$gid "$home"
  83 chown -R $uid:$group "$home" || {
  84         rm -rf /etc/ptmp "$home"
  85         exit 1
  86 }
  87
  88 # Is there a shadow password file?  If so add an entry.
  89 if [ -f /etc/shadow ]
  90 then
  91         echo "echo $user::0:0::: >>/etc/shadow"
  92         echo "$user::0:0:::" >>/etc/shadow || {
  93                 rm -rf /etc/ptmp "$home"
  94                 exit 1
  95         }
  96         pwd="##$user"
  97 else
  98         pwd=
  99 fi
 100
 101 # Finish up by adding a password file entry.
 102 echo "echo $user:$pwd:$uid:$gid:$user:$home: >>/etc/passwd"
 103 echo "$user:$pwd:$uid:$gid:$user:$home:" >>/etc/passwd || {
 104         rm -rf /etc/ptmp "$home"
 105         exit 1
 106 }
 107
 108 # Remove the lock.
 109 rm /etc/ptmp || exit
 110
 111 echo "
 112 The new user $user has been added to the system.  Note that the password,
 113 full name, and shell may be changed with the commands passwd(1), chfn(1),
 114 and chsh(1).  The password is now empty, so only console logins are possible."
 115 if [ $gid = 0 ]
 116 then
 117         echo "\
 118 Also note that a new operator needs an executable search path (\$PATH) that
 119 does not contain the current directory (an empty field or "." in \$PATH)."
 120 fi
 121 exit 0