mirror of https://github.com/uutils/shadow.git synced 2026-06-10 16:14:57 -07:00

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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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chpasswd(8) - update passwords in batch mode

NAME

chpasswd - update passwords in batch mode

SYNOPSIS

chpasswd [options]

DESCRIPTION

The chpasswd command reads a list of username:password pairs from standard input and uses this information to update a group of existing users. Each line is of the format:

username:password

By default the password is expected to be in cleartext (not yet supported in shadow-rs; use -e). With the -e flag, the password is expected to be already encrypted (pre-hashed).

OPTIONS

-c, --crypt-method METHOD: Use the specified crypt method. Supported values: SHA256, SHA512, YESCRYPT, DES, MD5.
-e, --encrypted: Supplied passwords are already encrypted (pre-hashed).
-m, --md5: Use MD5 encryption for cleartext passwords (deprecated).
-R, --root CHROOT_DIR: Apply changes in the CHROOT_DIR directory.
-s, --sha-rounds ROUNDS: Use the specified number of rounds for SHA256/SHA512 encryption.

EXIT STATUS

0: Success.
1: Permission denied, invalid input, file busy, or unexpected failure.

FILES

/etc/shadow: Secure user account information.

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