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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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groupmod(8) - modify a group definition

NAME

groupmod - modify a group definition

SYNOPSIS

groupmod [options] GROUP

DESCRIPTION

The groupmod command modifies the definition of the specified GROUP by modifying the appropriate entries in the group and gshadow databases.

OPTIONS

-g, --gid GID: Change the group ID to GID.
-n, --new-name NEW_GROUP: Change the name of the group to NEW_GROUP.
-o, --non-unique: Allow using a non-unique (duplicate) GID when used with -g.
-p, --password PASSWORD: Change the group password to the encrypted PASSWORD.
-P, --prefix PREFIX_DIR: Use PREFIX_DIR as a prefix for system file paths.
-R, --root CHROOT_DIR: Apply changes in the CHROOT_DIR directory.

EXIT STATUS

0: Success.
2: Invalid command syntax.
3: Invalid argument to option.
4: GID already in use.
6: Group does not exist.
9: Group name already in use.
10: Cannot update group file.

FILES

/etc/group: Group account information.
/etc/gshadow: Secure group account information.

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