EZ Linux Admin » Linux Commands

kill a linux process that won’t die

EZ linux — Fri, 03 Feb 2012 18:43:39 +0000

kill -s 9 [PID]

Also try it without the -s if it won’t go.

How to search a directory for a certain search string.

EZ linux — Mon, 23 Jan 2012 09:48:09 +0000

Pretty simple, this takes minimal load and delivers the data as it’s found.

Tracking down the biggest folders

EZ linux — Thu, 11 Aug 2011 19:17:00 +0000

du -ax --max-depth 1 /var/cpanel | sort -n | tail

This is a great command to simply find what folders are the biggest in a directory. You can replace the /var/cpanel with any folder and it will list everything in there and how big they are in order.

Once you find the big folder then search inside of that to find the biggest folder in there and so on.

Clear bash history through ssh command line

EZ linux — Sun, 30 May 2010 20:01:12 +0000

history -c

Path to date

EZ linux — Tue, 25 May 2010 03:22:09 +0000

The server path to date can very for different servers, you will need to run this command to find it:

which date

For most servers it is:

/bin/date

This is the same for perl and php

setroubleshoot bug

EZ linux — Mon, 24 May 2010 06:20:07 +0000

There is a bug with the new option in Centos 5 called setroubleshoot.

The bug spins the program over and over causing high memory and sometimes CPU use. Unfortunately there is no permanent fix yet, but if you see something like this high in your daily process log:

/usr/bin/python -E /usr/sbin/setroubleshootd

To fix for now you simply have to restart the process:

/etc/init.d/setroubleshoot restart

For a long term fix f this problem click here: setroubleshootd bug

When asking about a networking issue, get these details from the server

EZ linux — Mon, 05 Apr 2010 20:14:04 +0000

Kernal version

uname -a

Nic / Lan driver version

dmesg | grep r8169

Internet controller

lspci -nn | grep Ethernet

Details on etho nic card

sudo ethtool eth0

Module size

lsmod | grep r8169

Module versions

cat /proc/modules | grep r8169

Don’t worry all these commands are safe and just for reporting.

How to do a search and replace over multiple files

EZ linux — Fri, 19 Mar 2010 03:51:46 +0000

You could also use find and sed, but I find that this little line of perl works nicely.
perl -pi -w -e ‘s/search/replace/g;’ *.php

-e means execute the following line of code.
-i means edit in-place
-w write warnings
-p loop

Example I had the following style sheet in a section:

and I wanted the following instead:

As each expression is a regular expression you’ve got to escape the special characters such as forward slash and .
\.\.\/includes\/style\.css

So the final line of code ends up as
perl -pi -w -e ‘s/\.\.\/includes\/style\.css/admin\.css/g;’ *.php

Getting a md5sum error when tranferring a cpanel account?

EZ linux — Wed, 03 Mar 2010 12:19:41 +0000

This usually means you need to upgrade Perl on the server. Here is a example of a md5sum error.

The remote server didn’t report a correct md5sum of the archive. Please ensure you selected the correct type of remote server.

To fix upgrade Perl as shown here:

http://www.ezlinuxadmin.com/2009/08/upgrading-perl-on-cpanel/

My new favorite rsync command

EZ linux — Wed, 03 Mar 2010 12:04:33 +0000

rsync -vae ssh 12.123.123.123:/home/dwhsbackup/daily/username/ /backup/cpbackup/daily2/username/ –bwlimit=10000 –exclude-from ‘/root/exclude.txt’