Last command
last, lastb - show listing of last logged in users
The Last command searches back through the file /var/log/wtmp (or the file designated by the -f flag) and displays a list of all users logged in (and out) since that file was created. Names of users and tty's can be given, in which case last will show only those entries matching the arguments.
The Lastb command is the same as last, except that by default it shows a log of the file /var/log/btmp, which contains all the bad login attempts.
The pseudo user reboot logs in each time the system is rebooted. Thus last reboot will show a log of all reboots since the log file was created.
OPTIONS
-num
This is a count telling last how many lines to show.
-n num
The same.
-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".
-R
Suppresses the display of the hostname field.
-a
Display the hostname in the last column. Useful in combination with the next flag.
-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.
-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.
-o
Read an old-type wtmp file (written by linux-libc5 applications).
-x
Display the system shutdown entries and run level changes.
The Last command searches back through the file /var/log/wtmp (or the file designated by the -f flag) and displays a list of all users logged in (and out) since that file was created. Names of users and tty's can be given, in which case last will show only those entries matching the arguments.
The Lastb command is the same as last, except that by default it shows a log of the file /var/log/btmp, which contains all the bad login attempts.
The pseudo user reboot logs in each time the system is rebooted. Thus last reboot will show a log of all reboots since the log file was created.
OPTIONS
-num
This is a count telling last how many lines to show.
-n num
The same.
-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".
-R
Suppresses the display of the hostname field.
-a
Display the hostname in the last column. Useful in combination with the next flag.
-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.
-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.
-o
Read an old-type wtmp file (written by linux-libc5 applications).
-x
Display the system shutdown entries and run level changes.
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