ID(1) User Commands ID(1)

id - print real and effective user and group IDs

id [OPTION]... [USER]...

Print user and group information for each specified USER, or (when USER omitted) for the current user.
ignore, for compatibility with other versions
-Z, --context
print only the security context of the process
-g, --group
print only the effective group ID
-G, --groups
print all group IDs
-n, --name
print a name instead of a number, for -ugG
-r, --real
print the real ID instead of the effective ID, with -ugG
-u, --user
print only the effective user ID
-z, --zero
delimit entries with NUL characters, not whitespace;
not permitted in default format
display this help and exit
output version information and exit

Without any OPTION, print some useful set of identified information.

Written by Arnold Robbins and David MacKenzie.

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Copyright © 2020 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.

Full documentation
or available locally via: info '(coreutils) id invocation'
March 2020 GNU coreutils 8.32