id − print real and effective user and group IDs
id [OPTION]... [USER]
Print user and group information for the specified USER, or (when USER omitted) for the current user.
ignore, for compatibility with other versions
print only the security context of the process
print only the effective group ID
print all group IDs
print a name instead of a number, for −ugG
print the real ID instead of the effective ID, with −ugG
print only the effective user ID
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.
© 2018 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.
or available locally via: info '(coreutils) id invocation'