RHEL is hell

http://www.cyberciti.biz/faq/howto-install-c-cpp-compiler-on-rhel/

Splitting strings in shell script

Nice way to pass parameters to a script is to put them in a properties file and then read the file in the script and do something with each parameter in the file. But often it is neccessary to pass more than one parameter for each line. One way to do this is to use some kind of separator between the parameters and split each line in the script using the separator. Here is one way to do it.

Example input file:

foo:2
bar:109
baz:23


To read this file, we can use script like this:

#!/bin/sh
for LINE in `cat input_file.txt`
OLDIFS=$IFS
do
    IFS=":"
    arr=($LINE)
    echo "First: ${arr[0]}"
    echo "Second: ${arr[1]}
done
IFS=$OLDIFS

The output should be:

First: foo
Second: 2
First: bar
Second: 109
First: baz
Second: 23


How to make rsync work over several ssh hops

http://samba.anu.edu.au/rsync/firewall.html

Splunk best practices

http://www.webadminblog.com/index.php/splunk-best-practices/