coreutils: whoami invocation

1 
1 20.3 ‘whoami’: Print effective user ID
1 ======================================
1 
1 ‘whoami’ prints the user name associated with the current effective user
1 ID.  It is equivalent to the command ‘id -un’.
1 
11    The only options are ‘--help’ and ‘--version’.  ⇒Common
 options.
1 
1    An exit status of zero indicates success, and a nonzero value
1 indicates failure.
1