(coreutils) whoami invocation

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(coreutils) logname invocation

(coreutils) User information

(coreutils) groups invocation

 
 20.3 `whoami': Print effective user ID
 ======================================
 
 `whoami' prints the user name associated with the current effective
 user ID.  It is equivalent to the command `id -un'.
 
    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) logname invocation

(coreutils) User information

(coreutils) groups invocation