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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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userdel(8) - delete a user account

NAME

userdel - delete a user account and related files

SYNOPSIS

userdel [options] LOGIN

DESCRIPTION

The userdel command modifies the system account files, deleting all entries that refer to the user name LOGIN. The named user must exist.

The user's entry is removed from /etc/passwd and /etc/shadow. The user is also removed from membership lists in /etc/group and /etc/gshadow.

OPTIONS

-f, --force: Force removal of the account even if the user is still logged in. Also forces removal of the home directory and mail spool.
-P, --prefix PREFIX_DIR: Use PREFIX_DIR as a prefix for system file paths.
-r, --remove: Remove the user's home directory and mail spool.
-R, --root CHROOT_DIR: Apply changes in the CHROOT_DIR directory.

EXIT STATUS

0: Success.
1: Cannot update password file.
2: Invalid command syntax.
10: Cannot update group file.
12: Cannot remove home directory.

FILES

/etc/passwd: User account information.
/etc/shadow: Secure user account information.
/etc/group: Group account information.
/etc/gshadow: Secure group account information.

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