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logname
: Print current login name
logname
prints the calling user's name, as found in the file
`/etc/utmp', and exits with a status of 0. If there is no
`/etc/utmp' entry for the calling process, logname
prints
an error message and exits with a status of 1.
The only options are `--help' and `--version'. See section 2. Common options.