Man oldal kimenet
LAST, LASTB(1) User Commands LAST, LASTB(1) NAME last, lastb - show a listing of last logged in users SYNOPSIS last [options] [username...] [tty...] lastb [options] [username...] [tty...] DESCRIPTION last searches back through the /var/log/wtmp file (or the file designated by the -f option) and displays a list of all users logged in (and out) since that file was created. One or more usernames and/or ttys can be given, in which case last will show only the entries matching those arguments. Names of ttys can be abbreviated, thus last 0 is the same as last tty0. When catching a SIGINT signal (generated by the interrupt key, usually control-C) or a SIGQUIT signal, last will show how far it has searched through the file; in the case of the SIGINT signal last will then terminate. The pseudo user reboot logs in each time the system is rebooted. Thus last reboot will show a log of all the reboots since the log file was created. lastb is the same as last, except that by default it shows a log of the /var/log/btmp file, which contains all the bad login attempts. OPTIONS -a, --hostlast Display the hostname in the last column. Useful in combination with the --dns option. -d, --dns 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. -f, --file file Tell last to use a specific file instead of /var/log/wtmp. The --file option can be given multiple times, and all of the specified files will be processed. -F, --fulltimes Print full login and logout times and dates. -i, --ip Like --dns , but displays the host's IP number instead of the name. -number -n, --limit number Tell last how many lines to show. -p, --present time Display the users who were present at the specified time. This is like using the options --since and --until together with the same time. -R, --nohostname Suppresses the display of the hostname field. -s, --since time Display the state of logins since the specified time. This is useful, e.g., to easily determine who was logged in at a particular time. The option is often com‐ bined with --until. -t, --until time Display the state of logins until the specified time. --time-format format Define the output timestamp format to be one of notime, short, full, or iso. The notime variant will not print any timestamps at all, short is the default, and full is the same as the --fulltimes option. The iso variant will display the timestamp in ISO-8601 format. The ISO format contains timezone information, making it preferable when printouts are investigated outside of the system. -w, --fullnames Display full user names and domain names in the output. -x, --system Display the system shutdown entries and run level changes. TIME FORMATS The options that take the time argument understand the following formats: YYYYMMDDhhmmss YYYY-MM-DD hh:mm:ss YYYY-MM-DD hh:mm (seconds will be set to 00) YYYY-MM-DD (time will be set to 00:00:00) hh:mm:ss (date will be set to today) hh:mm (date will be set to today, seconds to 00) now yesterday (time is set to 00:00:00) today (time is set to 00:00:00) tomorrow (time is set to 00:00:00) +5min -5days NOTES The files wtmp and btmp might not be found. The system only logs information in these files if they are present. This is a local configuration issue. If you want the files to be used, they can be created with a simple touch(1) command (for example, touch /var/log/wtmp). FILES /var/log/wtmp /var/log/btmp AUTHOR Miquel van Smoorenburg ⟨miquels (kukac) cistron (pont) nl⟩ AVAILABILITY The last command is part of the util-linux package and is available from Linux Kernel Archive ⟨ftp://ftp.kernel.org/pub/linux/utils/util-linux/⟩. SEE ALSO login(1), wtmp(5), init(8), shutdown(8) util-linux October 2013 LAST, LASTB(1)
Usage: lastb [options] [<username>...] [<tty>...] Show a listing of last logged in users. Options: -<number> how many lines to show -a, --hostlast display hostnames in the last column -d, --dns translate the IP number back into a hostname -f, --file <file> use a specific file instead of /var/log/btmp -F, --fulltimes print full login and logout times and dates -i, --ip display IP numbers in numbers-and-dots notation -n, --limit <number> how many lines to show -R, --nohostname don't display the hostname field -s, --since <time> display the lines since the specified time -t, --until <time> display the lines until the specified time -p, --present <time> display who were present at the specified time -w, --fullnames display full user and domain names -x, --system display system shutdown entries and run level changes --time-format <format> show timestamps in the specified <format>: notime|short|full|iso -h, --help display this help and exit -V, --version output version information and exit For more details see last(1).