Info Catalog coreutils: id invocation coreutils: User information coreutils: whoami invocation

coreutils: logname invocation

 
 20.2 ‘logname’: Print current login name
 ========================================
 
 ‘logname’ prints the calling user’s name, as found in a
 system-maintained file (often ‘/var/run/utmp’ or ‘/etc/utmp’), and exits
 with a status of 0.  If there is no entry for the calling process,
 ‘logname’ prints an error message and exits with a status of 1.
 
    The only options are ‘--help’ and ‘--version’.  ⇒Common
 options.
 
    An exit status of zero indicates success, and a nonzero value
 indicates failure.
 

Info Catalog coreutils: id invocation coreutils: User information coreutils: whoami invocation