NAME

id − print the user name and ID, and group name and ID

SYNOPSIS

id [ −a ]

DESCRIPTION

id displays the calling process’s ID and name.  It also displays the group ID and name.  If the real effective IDs do not match, both are printed. 

The -a option reports all the groups to which the invoking process belongs.  ID, and your username.  If your real and effective IDs do not match, both are printed. 

The −a option reports all the groups to which the invoking user belongs. 

SEE ALSO

getuid(2). 

  —  Essential Utilities