grpck

verify integrity of group files

TLDR

Check group file integrity

$ sudo grpck

Read-only mode

$ sudo grpck -r

Sort by GID

$ sudo grpck -s

Check specific files

$ sudo grpck [/etc/group] [/etc/gshadow]

SYNOPSIS

grpck [options] [group] [shadow]

grpck verifies the integrity of group information files. It checks for duplicate entries, valid field formats, and consistency between /etc/group and /etc/gshadow.
The tool can automatically fix some issues when run interactively. It is essential for maintaining system security and proper group functionality.

PARAMETERS

GROUP

Group file to check (default /etc/group).

SHADOW

Shadow group file (default /etc/gshadow).

-r

Read-only mode, report only.

-s

Sort entries by GID.

-R DIR

Chroot directory.

--help

Display help information.

CAVEATS

Requires root access. Interactive fixes need confirmation. Back up files before repair.

HISTORY

grpck was developed as part of the shadow password suite for Unix/Linux system administration.