Difference between revisions of "Usermod"

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[[Category:Linux Shell Commands]]
{{to htyp}}
[[Techniques]]: [[Linux]]: [[usermod]]
==Manpage Text==
===Name===
:'''usermod''' - Modify a [[Linux:user|user]] account
 
===Synopsis===
:usermod [-c <u>comment</u>] [-d <u>home_dir</u> [ -m]] [-e <u>expire_date</u>] [-f <u>inactive_time</u>] [-g <u>initial_group</u>] [-G <u>group</u>[,...]] [-l <u>login_name</u>] [-p <u>passwd</u>] [-s <u>shell</u>] [-u <u>uid</u> [ -o]] [-L|-U] <u>login</u>
===Description===
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 <u>comment</u>'''
*:The  new  value of the user's password file comment field.  It is normally modified using  the  [[chfn]](1) utility.
*'''-d <u>home_dir</u>'''
*:The  user's  new login directory.  If the -m option is given the contents of the current home directory will  be  moved to the new home directory, which is created if it does not already exist.
*'''-e <u>expire_date</u>'''
*:The date on which the user  account  will  be  disabled. The  date is specified in the format YYYY-MM-DD.
*'''-f <u>inactive_days</u>'''
*:The number of days after a password  expires  until the  account is permanently disabled.  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 <u>initial_group</u>'''
*:The [[Linux:group|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 <u>group</u>,[...]'''
*:A list of supplementary [[Linux:group|group]]s 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 <u>login_name</u>'''
*: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 <u>passwd</u>'''
*:The encrypted password, as returned by [[crypt]](3).
*'''-s <u>shell</u>'''
*:The name of the user's new  login  shell.  Setting this field to blank causes the system to select the default login shell.
*'''-u <u>uid</u>'''
*: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 typically 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, effectively 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.
 
===Caveats===
[[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 executed 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.
===Files===
*'''/etc/passwd''' - user account information
*'''/etc/shadow''' - secure user account information
*'''/etc/group''' - group information
===See Also===
[[chfn]](1), [[chsh]](1), [[crypt]](3), [[groupadd]](8), [[groupdel]](8), [[groupmod]](8), [[passwd]](1), [[useradd]](8), [[userdel]](8)
===Author===
Julianne Frances Haugh (jfh@austin.ibm.com)
==Edit Log==
*2005-06-12 Transcribed from manpage in Red Hat 7

Latest revision as of 18:33, 14 October 2005

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