I am new to bash and trying to write a script that disables kworker business as in aMaia's answer here.
So far, I have this, which I run from root:
1 #!/bin/bash
2
3 cd /sys/firmware/acpi/interrupts
4 for i in gpe[[:digit:]]* # Don't mess with gpe_all
5 do
6 num=`awk '{print $1}' $i`
7 if (( $num >= 1000 )); then # potential CPU hogs?
8 # Back it up and then disable it!!
9 cp $i /root/${i}.backup
10 echo "disable" > $i
11 fi
12 done
But running it results in:
./kkiller: line 10: echo: write error: Invalid argument
What is going on here? I thought $i was just the file name, which seems like the correct syntax for echo.
Suggestions for cleaning up/improving the script in general are also appreciated!
Update: With set -vx added to the top of the script, here is a problematic iteration:
+ for i in 'gpe[[:digit:]]*'
awk '{print $1}' $i
++ awk '{print $1}' gpe66
+ num=1024908
+ (( 1024908 >= 1000 ))
+ cp gpe66 /root/gpe66.backup
+ echo disable
./kkiller: line 10: echo: write error: Invalid argument
I think it has something to with permissions. I don't think root has write access to those files by default. Try echoing manually 'disable' to that file, even as root you get the same error shown. So to make your script work, first do chmod 744 on $i before your echo, it should do the trick.
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