-f file
Tells last to use a specific file instead of /var/log/wtmp.
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-num This is a count telling last how many lines to show.
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-n num The same.
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-t YYYYMMDDHHMMSS
Display the state of logins as of the specified time. This is useful, e.g., to determine easily
who was logged in at a particular time -- specify that time with -t and look for "still logged
in".
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-R Suppresses the display of the hostname field.
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-a Display the hostname in the last column. Useful in combination with the next flag.
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-d For non-local logins, Linux stores not only the host name of the remote host but its IP number as
well. This option translates the IP number back into a hostname.
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-F Print full login and logout times and dates.
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-i This option is like -d in that it displays the IP number of the remote host, but it displays the
IP number in numbers-and-dots notation.
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-o Read an old-type wtmp file (written by linux-libc5 applications).
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-w Display full user and domain names in the output.
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-x Display the system shutdown entries and run level changes.
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