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📛 NAME

chfn - change real user name and information

🚀 Quick Reference

Use Case	Command	Description
Change full name	chfn --full-name "John Doe"	Update the user's full name (GECOS field).
Change home phone	chfn --home-phone 555-1234	Set the home phone number.
Change room number	chfn --room 123	Set the office room number.
Change office phone	chfn --work-phone 555-5678	Set the work phone number.
Interactive mode	chfn	Prompt for all fields (no options given).
Superuser change other field	sudo chfn --other "accounting info"	Modify the undefined GECOS portion (superuser only).

📖 SYNOPSIS

chfn [options] [LOGIN]

📝 DESCRIPTION

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.

⚙️ OPTIONS

The options which apply to the chfn command are:

• -f, --full-name FULL_NAME — 📛 Change the user's full name.
• -h, --home-phone HOME_PHONE — 🏠 Change the user's home phone number.
• -o, --other OTHER — 🔧 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, --room ROOM_NUMBER — 🚪 Change the user's room number.
• -R, --root CHROOT_DIR — 📂 Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory.
• -u, --help — ❓ Display help message and exit.
• -w, --work-phone WORK_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.

🔧 CONFIGURATION

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.

📁 FILES

• /etc/login.defs — Shadow password suite configuration.
• /etc/passwd — User account information.

🔗 SEE ALSO

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

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shadow-utils 4.8.1 02/06/2024 CHFN(1)

📛 NAME 🚀 Quick Reference 📖 SYNOPSIS 📝 DESCRIPTION ⚙️ OPTIONS 🔧 CONFIGURATION 📁 FILES 🔗 SEE ALSO