(coreutils) logname invocation

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(coreutils) id invocation

(coreutils) User information

(coreutils) whoami 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 `/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'.   Common
 options.
 
    An exit status of zero indicates success, and a nonzero value
 indicates failure.
 

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(coreutils) id invocation

(coreutils) User information

(coreutils) whoami invocation