System Administration
sysrq-trigger
Magic SysRq key - emergency controls.
Ubuntu
CentOS
Debian
Arch
SUSE
Fedora
Verified: 2026-05-10
Syntax
$echo BEFEHL > /proc/sys/kernel/sysrq
Examples
$echo s > /proc/sysrq-trigger (sync)
$echo u > /proc/sysrq-trigger (umount)
Typical use cases
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Standard usage
sysrq-trigger --help
Note
Emergency system control.
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