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arlawson1
Silver

What does the "SysRq" button do?

What does the SysRq button do on the keyboard? It is located next to Scroll Lock.
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3 Replies
anna63
Bronze

Re: What does the "SysRq" button do?

'sysrq' key functions the same way as the 'print screen' key. Smiley Happy
 
Anna
 
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vmansd
Gold

Re: What does the "SysRq" button do?

It's an anachronism left over from the days of terminals connected to larger computers. Why it's still on modern keyboards is a mystery - though I suppose there are few special purpose programs still in existance that use it.

It, and the Break key, can be considered the appendix of the keyboard -there, but long since useless.

Val
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anna63
Bronze

Re: What does the "SysRq" button do?

In Linux, the kernel can be configured (with CONFIG_MAGIC_SYSRQ=y) to provide emergency functions for system debugging. It is mainly intended for use when the system
is otherwise unresponsive, but at least some of the kernel still works. Alt+SysRq+letter can be used for synching disks, remounting filesystems readonly, dumping CPU state,
rebooting, and other functions
On 84-key keyboards, SysReq was a key of its own. On the later 101-key keyboard, it shares a physical key with the Print Screen key function. One must hold down the Alt
key while pressing this "dual-function" key to invoke SysReq.
SysReq (short for System Request) is a key on keyboards for PCs that has no standard use
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