ID - User Identity Display#

Print user and group identity information including UID (user ID), GID (group ID), and all supplementary group memberships. Essential for permission debugging and understanding process security context.

Usage#

bash

id-tool [options] [username]

Without arguments, shows information for the current user. Specify a username to query another user's identity details.

Options#

• -u: Show only effective user ID
• -g: Show only effective group ID
• -G: Show all supplementary group IDs
• -n: Display names instead of numeric IDs

Examples#

bash

# Show full identity
id-tool

# Show user ID only
id-tool -u

# Show all groups for user
id-tool -G www-data