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Pierre Warnier 81d0e1776d docs/fixes: man pages, benchmarks, BSD research, Copilot findings

Fixes #56 — 14 man pages in docs/man/ (markdown format).
Fixes #67 — 8 Copilot findings fixed:
  - useradd: proper date validation (Feb 31 rejected)
  - userdel/usermod: --root wired to SysRoot
  - usermod: --expiredate validates input
  - usermod: --login validates name + updates shadow/group
  - userdel: -f separated from -r behavior
  - useradd: home dir resolved through SysRoot
  - skel: preserves directory permissions
Fixes #69 — benchmark script (benches/benchmark.sh)
Fixes #70 — FreeBSD/NetBSD reference (docs/FREEBSD-NETBSD-REFERENCE.md)

456 tests, zero clippy warnings.

2026-03-24 13:05:40 +01:00

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chfn(1) - change user finger information

NAME

chfn - change real user name and information

SYNOPSIS

chfn [options] [LOGIN]

DESCRIPTION

The chfn command changes the user finger information stored in the GECOS field of /etc/passwd. This information is typically displayed by the finger(1) program and includes the user's full name, office room number, and phone numbers.

A normal user may only change their own finger information; the superuser may change the information for any user. Only the superuser may change the "other" field.

At least one option flag (-f, -r, -w, -h, or -o) must be specified.

OPTIONS

-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. Only root may set this field.
-r, --room ROOM: Change the user's room number.
-R, --root CHROOT_DIR: Apply changes in the CHROOT_DIR directory.
-w, --work-phone WORK_PHONE: Change the user's office phone number.

EXIT STATUS

0: Success.
1: Permission denied or operation failed.

FILES

/etc/passwd: User account information.

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