IFS Internal Field Separator in Bash Scripting

IFS stands for  Internal Field Separator - it's a character that separate fields. In the example you posted it is set to new line character (\n), so after setting it for will process text line by line. In that example you could change value of $IFS (to some letter that you have in your input file) and check how text will be splitted.

 

[root@ip-192-168-1-36 tmp]# for i in `cat sample.txt`; do echo $i; done
Mar 10
Mar 11
Mar 7
Mar 8
Mar 9
[root@ip-192-168-1-36 tmp]# IFS=$' '
[root@ip-192-168-1-36 tmp]# for i in `cat sample.txt`; do echo $i; done

Mar
10
Mar
11
Mar
7
Mar
8
Mar
9
[root@ip-192-168-1-36 tmp]# IFS=$'\n'
[root@ip-192-168-1-36 tmp]# for i in `cat sample.txt`; do echo $i; done
Mar 10
Mar 11
Mar 7
Mar 8
Mar 9
[root@ip-192-168-1-36 tmp]#

Installing rar in linux

for 64 bit

install unrar centos x64
#wget http://pkgs.repoforge.org/unrar/unrar-4.0.7-1.el6.rf.x86_64.rpm
#rpm -Uvh unrar-4.0.7-1.el6.rf.x86_64.rpm

install rar centos x64
#wget http://pkgs.repoforge.org/rar/rar-3.8.0-1.el6.rf.x86_64.rpm
#rpm -Uvh rar-3.8.0-1.el6.rf.x86_64.rpm

for 32 bit

install unrar centos 32
#wget http://pkgs.repoforge.org/unrar/unrar-4.0.7-1.el6.rf.i686.rpm
#rpm -Uvh unrar-4.0.7-1.el6.rf.i686.rpm

install rar centos 32

#wget http://pkgs.repoforge.org/rar/rar-3.8.0-1.el6.rf.i686.rpm

#rpm -Uvh rar-3.8.0-1.el6.rf.i686.rpm

you can also use matching OS rpm from

http://pkgs.repoforge.org/rpmforge-release/

 

Installing Amazon Command Line using PIP

Installing the repo needed for pip

cd /tmp
wget http://mirror-fpt-telecom.fpt.net/fedora/epel/6/i386/epel-release-6-8.noarch.rpm
rpm -ivh epel-release-6-8.noarch.rpm

Installing C-compiler for Pip

yum install gcc

Installing amazon cli

pip install awscli

Configure Amazon Cli

aws configrue

you need aws access key ,secret key, default region and output format.