usermod
Name
usermod -- modify a user account
Synopsis
usermod [-c comment] [-d home_dir [ -m]] [-g initial_group] [-G group [,...]] [-l login_name] [-p passwd] [-s shell] [-u uid [ -o]] login Options
-c comment | | specifies the new value of the user's password file comment field. |
-d home_dir | | specifies 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. |
-g initial_group | | specifies the group name or number of the user's new initial login group.
The group name shall exist. A group number shall refer to an already
existing group. |
-G group,[...] | | specifies 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 | | changes the name of the user 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 | | is the encrypted password, as returned by crypt(3). |
-s shell | | specifies 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 [-o] | | specifies the numerical value of the user's ID. This value shall be unique,
unless the -o option is used. The value shall be non-negative. 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 shall be
altered manually. |