proc.5: Document /proc/sysrq-trigger

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

diff --git a/man5/proc.5 b/man5/proc.5
index 3dab9204b1209c5ace5af5b19b0595377c72cd21..f2cc1e7516f7ffca502365789ade91cea632098e 100644 (file)
--- a/man5/proc.5
+++ b/man5/proc.5
@@ -2503,6 +2503,15 @@ The default value is 0.
 1 and 2 are for failover of clustering.
 Select either according to your policy of failover.
 .TP
+.IR /proc/sysrq-trigger " (since Linux 2.4.21)"
+Writing a character to this file triggers the same SysRq function as
+typing ALT-SysRq-<character> (see the description of
+.IR /proc/sys/kernel/sysrq ).
+This file is normally only writable by
+.IR root .
+For further details see the kernel source file
+.IR Documentation/sysrq.txt .
+.TP
 .I /proc/sysvipc
 Subdirectory containing the pseudo-files
 .IR msg ", "  sem " and "  shm "."