Linux From Scratch - Version 7.0
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last Shows which users last logged in (and out), searching back through the /var/log/wtmp file;
it also shows system boots, shutdowns, and run-level changes
lastb Shows the failed login attempts, as logged in /var/log/btmp
mesg Controls whether other users can send messages to the current user's terminal
pidof Reports the PIDs of the given programs
poweroff Tells the kernel to halt the system and switch off the computer (see halt)
reboot Tells the kernel to reboot the system (see halt)
runlevel Reports the previous and the current run-level, as noted in the last run-level record in /var/
run/utmp
shutdown Brings the system down in a secure way, signaling all processes and notifying all logged-in users
sulogin Allows root to log in; it is normally invoked by init when the system goes into single user mode
telinit Tells init which run-level to change to
utmpdump Displays the content of the given login file in a more user-friendly format
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