some linux tricks I didnt know
now there are a lot of tricks I dont know, but here are a few that were rather interestingthat I havent picked up in my years of emergency linux support work.
apropos - apropos - search the whatis databasefor strings
whereis- locate the binary, source, and manual page filesfor a command on disk (adding -b will only give binary returns)
Alt + SysRq + B
If you’re not running any crucial, scheduled tasks or inthe middle of composing a letter or an e-mail then this key combination may be theone to use. It will reboot the system immediately without bothering to sync or unmountdisks.
Alt + SysRq + R
If you cannot get to a terminal window by using Ctrl+ Alt + F2 then use this key combination (pressed altogether) to get a keyboard(this is because this key combination turns off what is called keyboard raw mode.Pressing these keys allows keyboard input even after your X-Windows session has crashed/frozen).Now, try Ctrl + Alt + F2 again and you can close down from the terminal.If that fails move on to the next option.
Alt + SysRq + S
This key combo does just what it says on the tin: it (S)ync’sall filesystems which reduces the possibility of loosing any data and possibly obviatingthe need for the system to run fsck upon reboot.
Alt + SysRq + U
As you might guess, this one tries to unmount disks andremount them as read only.
Alt + SysRq + O
Not so obvious, but this will power off your machine withoutsyncing or unmounting disks (but it won’t reboot)
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