chfn - change real user name and information

       The following configuration variables in /etc/login.defs change the behavior of this tool:

       CHFN_RESTRICT (string)
           This parameter specifies which values in the gecos field of the /etc/passwd file may be changed by
           regular users using the chfn program. It can be any combination of letters f, r, w, h, for Full name,
           Room number, Work phone, and Home phone, respectively. For backward compatibility, yes is equivalent
           to rwh and no is equivalent to frwh. If not specified, only the superuser can make any changes. The
           most restrictive setting is better achieved by not installing chfn SUID.

       The chfn command changes user fullname, office room number, office phone number, and home phone number
       information for a user's account. This information is typically printed by finger(1) and similar
       programs. A normal user may only change the fields for her own account, subject to the restrictions in
       /etc/login.defs. (The default configuration is to prevent users from changing their fullname.) The
       superuser may change any field for any account. Additionally, only the superuser may use the -o option to
       change the undefined portions of the GECOS field.

       These fields must not contain any colons. Except for the other field, they should not contain any comma
       or equal sign. It is also recommended to avoid non-US-ASCII characters, but this is only enforced for the
       phone numbers. The other field is used to store accounting information used by other applications.

/etc/login.defs
           Shadow password suite configuration.

       /etc/passwd
           User account information.

       chfn - change real user name and information

       The options which apply to the chfn command are:

       -f, --full-nameFULL_NAME
           Change the user's full name.

       -h, --home-phoneHOME_PHONE
           Change the user's home phone number.

       -o, --otherOTHER
           Change the user's other GECOS information. This field is used to store accounting information used by
           other applications, and can be changed only by a superuser.

       -r, --roomROOM_NUMBER
           Change the user's room number.

       -R, --rootCHROOT_DIR
           Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR
           directory. Only absolute paths are supported.

       -u, --help
           Display help message and exit.

       -w, --work-phoneWORK_PHONE
           Change the user's office phone number.

       If none of the options are selected, chfn operates in an interactive fashion, prompting the user with the
       current values for all of the fields. Enter the new value to change the field, or leave the line blank to
       use the current value. The current value is displayed between a pair of [] marks. Without options, chfn
       prompts for the current user account.

chsh(1), login.defs(5), passwd(5).

shadow-utils 4.16.0                                12/02/2024                                            CHFN(1)

chfn [options] [LOGIN]