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RedHat 9 (Linux i386) - man page for usermod (redhat section 8)

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USERMOD(8)									       USERMOD(8)

       usermod - Modify a user account

       usermod [-c comment] [-d home_dir [-m]]
	       [-e expire_date] [-f inactive_time]
	       [-g initial_group] [-G group [,...]]
	       [-l login_name] [-p passwd]
	       [-s shell] [-u uid [-o]] [-L|-U] login

       The  usermod  command  modifies	the  system account files to reflect the changes that are
       specified on the command line.  The options which apply to the usermod command are:

       -c comment
	      The new value of the user's password file comment field.	It is  normally  modified
	      using the chfn(1) utility.

       -d home_dir
	      The user's new login directory.  If the -m option is given the contents of the cur-
	      rent home directory will be moved to the new home directory, which is created if it
	      does not already exist.

       -e expire_date
	      The  date on which the user account will be disabled.  The date is specified in the
	      format YYYY-MM-DD.

       -f inactive_days
	      The number of days after a password expires until the account is	permanently  dis-
	      abled.   A value of 0 disables the account as soon as the password has expired, and
	      a value of -1 disables the feature.  The default value is -1.

       -g initial_group
	      The group name or number of the user's new initial login	group.	 The  group  name
	      must  exist.   A group number must refer to an already existing group.  The default
	      group number is 1.

       -G group,[...]
	      A list of supplementary groups which the user is also a member of.  Each	group  is
	      separated from the next by a comma, with no intervening whitespace.  The groups are
	      subject to the same restrictions as the group given with the  -g	option.   If  the
	      user is currently a member of a group which is not listed, the user will be removed
	      from the group

       -l login_name
	      The name of the user will be changed from login to  login_name.	Nothing  else  is
	      changed.	 In particular, the user's home directory name should probably be changed
	      to reflect the new login name.

       -p passwd
	      The encrypted password, as returned by crypt(3).

       -s shell
	      The name of the user's new login shell.  Setting this field  to  blank  causes  the
	      system to select the default login shell.

       -u uid The  numerical  value  of  the user's ID.  This value must be unique, unless the -o
	      option is used.  The value must be non-negative.	Values between 0 and 99 are typi-
	      cally  reserved  for  system accounts.  Any files which the user owns and which are
	      located in the directory tree rooted at the user's home  directory  will	have  the
	      file  user  ID  changed  automatically.  Files outside of the user's home directory
	      must be altered manually.

       -L     Lock a user's password.  This puts a '!' in front of the encrypted password, effec-
	      tively disabling the password.  You can't use this option with -p or -U.

       -U     Unlock a user's password.  This removes the '!' in front of the encrypted password.
	      You can't use this option with -p or -L.

       usermod will not allow you to change the name of a user who is logged in.  You  must  make
       certain that the named user is not executing any processes when this command is being exe-
       cuted if the user's numerical user ID is being changed.	You must change the owner of  any
       crontab files manually.	You must change the owner of any at jobs manually.  You must make
       any changes involving NIS on the NIS server.

       /etc/passwd - user account information
       /etc/shadow - secure user account information
       /etc/group - group information

       chfn(1), chsh(1), passwd(1), crypt(3), groupadd(8), groupdel(8), groupmod(8),  useradd(8),

       Julianne Frances Haugh (jockgrrl@ix.netcom.com)

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