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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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pwck(8) - verify integrity of password files

NAME

pwck - verify integrity of password files

SYNOPSIS

pwck [options] [passwd [shadow]]

DESCRIPTION

The pwck command verifies the integrity of the system authentication information. It checks that all entries in /etc/passwd and /etc/shadow have the proper format and contain valid data.

Checks performed include:

Correct number of fields
Unique and valid user names
Valid user and group identifiers
Valid primary group
Valid home directory
Valid login shell
Matching passwd/shadow entries

OPTIONS

-q, --quiet: Report only errors, suppress warnings.
-r, --read-only: Display errors and warnings but do not modify files.
-R, --root CHROOT_DIR: Apply changes in the CHROOT_DIR directory.
-s, --sort: Sort entries by UID.

EXIT STATUS

0: Success.
1: Invalid command syntax.
2: One or more bad password entries.
3: Cannot open files.
4: Cannot lock files.
5: Cannot update files.

FILES

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

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