Linux: December 2003 Archives

Magic SysRq key (linux 魔術鍵)

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Kernel hacking -> Magic SysRq key

press Alt+PrintScreen+?


echo 0 > /proc/sys/kernel/sysrq

echo 1 > /proc/sys/kernel/sysrq

* What are the 'command' keys?
'r' - Turns off keyboard raw mode and sets it to XLATE.

'k' - Secure Access Key (SAK) Kills all programs on the current virtual
console. NOTE: See important comments below in SAK section.

'b' - Will immediately reboot the system without syncing or unmounting
your disks.

'o' - Will shut your system off (if configured and supported).

's' - Will attempt to sync all mounted filesystems.

'u' - Will attempt to remount all mounted filesystems read-only.

'p' - Will dump the current registers and flags to your console.

't' - Will dump a list of current tasks and their information to your

'm' - Will dump current memory info to your console.

'0'-'9' - Sets the console log level, controlling which kernel messages
will be printed to your console. ('0', for example would make
it so that only emergency messages like PANICs or OOPSes would
make it to your console.)

'e' - Send a SIGTERM to all processes, except for init.

'i' - Send a SIGKILL to all processes, except for init.

'l' - Send a SIGKILL to all processes, INCLUDING init. (Your system
will be non-functional after this.)

'h' - Will display help ( actually any other key than those listed
above will display help. but 'h' is easy to remember :-)

linux date set format

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date 122012301999.20 #將系統時間設為1999年12月20日12時30分20秒


March 2008

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This page is a archive of entries in the Linux category from December 2003.

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