logname - phpMan

File: coreutils.info,  Node: logname invocation,  Next: whoami invocation,  Prev: id invocation,  Up: User information
20.2 'logname': Print current login name
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'logname' prints the calling user's name, as found in a
system-maintained file (often '/var/run/utmp' or '/var/run/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'.  *Note Common
options::.
   An exit status of zero indicates success, and a nonzero value
indicates failure.