Change proc value as a user in a script?

Brian1 · 01-22-2005, 08:01 PM

Been experimenting and writing more simply scripts and have run into issues that only root can do. I have worked some issues out with sudo but don't think sudo will work for this script.

Need a little help in a simply script I have created. I would like to change the processor speed step but cannot do it as a user. Only root can make the change. What can I do in my script to make it work for a user (really I am the only to make use of it).

Script called Throttle50

Code:

#!/bin/sh

# throttle to 50%
echo -n 4 > /proc/acpi/processor/CPU0/throttling

# copy cpu0 info
cat /proc/acpi/processor/CPU0/info > /storage1/systeminfo/p2

# copy cpu0 throttle speed
cat /proc/acpi/processor/CPU0/throttling > /storage1/systeminfo/p4

# Merge all info into one file
cat /storage1/systeminfo/p* > /storage1/systeminfo/Processorinfo.txt

# Print the output to the screen so as to know script finished correctly
xmessage -center -file /storage1/systeminfo/Processorinfo.txt

Also would like to create simply scripts to stop eth1, change eth1 information (have 6 different wireless sites I visit during a month's time), then restart. I have writing the script to stop and start as user with sudo, but cannot figure out how to rewrite the file:/etc/sysconfig/network-scripts/ifcfg-eth1 as a user but I guess it still needs to remain as root ownership when done. Pretty much the same thing as above

Thanks for your help an time.
Brian1
" Google the Linux way @ http://www.google.com/linux "

/bin/bash · 01-23-2005, 06:59 AM

Are you saying that you cannot do this?
sudo echo -n 4 > /proc/acpi/processor/CPU0/throttling

Quote:

but cannot figure out how to rewrite the file:/etc/sysconfig/network-scripts/ifcfg-eth1

If you have 6 files e.g.
wireless1.ifcfg-eth1
wireless2.ifcfg-eth1
wireless3.ifcfg-eth1
wireless4.ifcfg-eth1
wireless5.ifcfg-eth1
wireless6.ifcfg-eth1

Then would this not work?
sudo mv wireless1.ifcfg-eth1 /etc/sysconfig/network-scripts/ifcfg-eth1

Brian1 · 01-23-2005, 10:48 AM

No that does not work for me. It says-

Code:

[crusher58@lcomp58 ~]$ sudo echo -n 4 > /proc/acpi/processor/CPU0/throttling
bash: /proc/acpi/processor/CPU0/throttling: Permission denied
[crusher58@lcomp58 ~]$

I have added /bin/echo to my sudoers file and all other commands work fine from it.

. Haven't tried the networking deal let. I figured if I get this to work then the other would be no problem.

Brian1
" Google the Linux way @ http://www.google.com/linux "

Brian1 · 01-26-2005, 07:57 PM

Final figured it out myself. Required using chown first. Here's my script.

Code:

#!/bin/sh

# throttle to 50%
sudo chown brian.brian /proc/acpi/processor/CPU0
sudo chown brian.brian /proc/acpi/processor/CPU0/throttling
sudo echo -n 4 > /proc/acpi/processor/CPU0/throttling
sudo chown root.root /proc/acpi/processor/CPU0/throttling
sudo chown root.root /proc/acpi/processor/CPU0

# copy cpu0 info
cat /proc/acpi/processor/CPU0/info > /storage1/systeminfo/p2

# copy cpu0 throttle speed
cat /proc/acpi/processor/CPU0/throttling > /storage1/systeminfo/p4

# Merge all info into one file
cat /storage1/systeminfo/p* > /storage1/systeminfo/Processorinfo.txt

# Print the output to the screen
xmessage -center -file /storage1/systeminfo/Processorinfo.txt

Thanks all for the help.
Brian1
" Google the Linux way @ http://www.google.com/linux "