id

Display current user and group identity. More information: https://www.gnu.org/software/coreutils/id.

Display current user's ID (UID), group ID (GID) and groups to which they belong:
id
Display the current user identity as a number:
id -u
Display the current group identity as a number:
id -g
Display an arbitrary user's ID (UID), group ID (GID) and groups to which they belong:
id {{username}}

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