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]
DESCRIPTION
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.
INSTALL
sudo apt install passwd
sudo pacman -S shadow
sudo apk add shadow
sudo zypper install shadow
nix profile install nixpkgs#shadow
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.
