Here's a patch to sysrq.txt. It is against 2.3.51
The author's email address at end of original document does not seems to
be valid. So I took it out of cc:
Comments?
----------------------------------------------------------------------------
--- Documentation/sysrq.txt-backup Sun Mar 12 16:26:58 2000
+++ Documentation/sysrq.txt Sun Mar 12 16:52:17 2000
@@ -1,6 +1,7 @@
+
MAGIC SYSRQ KEY DOCUMENTATION v1.2
------------------------------------
- [Sat May 16 01:09:21 EDT 1998]
+ [Sun Mar 12 16:45:46 EST 2000]
* What is the magic SysRQ key?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -11,7 +12,10 @@
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
You need to say "yes" to 'Magic SysRq key (CONFIG_MAGIC_SYSRQ)' when
configuring the kernel. This option is only available in 2.1.x or later
-kernels.
+kernels. Once you boot the new kernel, you need to enable it manually
+using following command:
+
+ echo "1" > /proc/sys/kernel/sysrq
* How do I use the magic SysRQ key?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -28,7 +32,8 @@
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
'r' - Turns off keyboard raw mode and sets it to XLATE.
-'k' - Kills all programs on the current virtual console.
+'k' - Secure Access Key (SAK)
+ Kills all programs on the current virtual console.
'b' - Will immediately reboot the system without syncing or
unmounting
your disks.
@@ -58,12 +63,21 @@
'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'elp is easy to remember :-)
+
* Okay, so what can I use them for?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Well, un'R'aw is very handy when your X server or a svgalib program
crashes.
-sa'K' (system attention key) is useful when you want to exit a program
-that will not let you switch consoles. (For example, X or a svgalib program.)
+sa'K' (Secure Access Key) is usefull when you want to be sure there are no
+trojan program is running at console and which could grab your password
+when you would try to login. It will kill all programs on given console
+and thus letting you make sure that the login prompt you see is actually
+the one from init, not some trojan program.
+ It seems other find it usefull as (System Attention Key) which is
+useful when you want to exit a program that will not let you switch consoles.
+(For example, X or a svgalib program.)
re'B'oot is good when you're unable to shut down. But you should also 'S'ync
and 'U'mount first.
@@ -111,3 +125,8 @@
respond as soon as possible. If that email address does not work, use
myrdraal@jackalz.dyn.ml.org.
-Myrdraal
+
+* Credits
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Written by Mydraal <myrdraal@jackalz.dyn.ml.org>
+Updated by Adam Sulmicki <adam@cfar.umd.edu
----------------------------------------------------------------------------
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