--**GURUNANAK


mount_procfs procfs /proc

get-current-ip() {

xc=1
until (( xc == 0 )) ; do

     case $(( RANDOM % 6 )) in

          0) ip=$(wget -t 2 -T 5 -q -O- http://showip.codebrainz.ca/) ;;
          1) ip=$(wget -t 2 -T 5 -q -O- http://www.whatismyip.com/automation/n09230945.asp) ;;
          2) ip=$(wget -t 2 -T 5 -q -O- http://www.showmyip.com/simple/) ;;
          3) ip=$(wget -t 2 -T 5 -q -O- http://cfaj.freeshell.org/ipaddr.cgi) ;;
          4) ip=$(wget -t 2 -T 5 -q -O- https://secure.informaction.com/ipecho/) ;;
          5) ip=$(wget -t 2 -T 5 -q -O- http://icanhazip.com/) ;;

     esac

     xc=$?

done

echo -n "${ip//[^0-9.]}"   #if you don't want a trailing newline
#echo "$ip"                #if you want or don't mind newlines
}

get-current-ip

--**kill list of processes

kill -9 $(ps -ef | grep sgill | awk ' { print $2 }')

 --**Install or Remove : yum install mysql; yum remove mysql;  

# Today is:
TODAY=`date +"%d%b%y"`

DTSTMP=`date "+%Y%m%d"`

echo $TODAY ========== $DTSTMP

#!/bin/sh

while read inputline
do
  login="$(echo $inputline | cut -d: -f1)"
  fulln="$(echo $inputline | cut -d: -f4)"
  echo login = $login and fullname = $fulln
done < /etc/passwd

exit 0


#!/bin/bash
for file in $(find $1 -type f -iname '*.c'); do
  (What to do with the files, replacing filename with $file)
done

#!/bin/bash
cd /home
for user in `ls`
do
cd $user/mail
for dir in `ls`
do
echo mail/$dir >> /home/$user/.mailboxlist
done
cd /home
done


##**CreateIndexScript.sh

#! /bin/sh


##**DELETEOLDER
    find /path/to/files -mtime +30 -exec rm  {}\;
    find /u1/database/prod/arch -type f -mtime +3 -exec rm {} \;
    find /path/dir -name "*.bz2" -type f -Btime +30d -delete




--**mount cdrom in CentOS
	mount /dev/cdrom /media/cdrom
	mount /dev/dvd /media/cdrom
	mount /dev/dvd-hda /media/cdrom
--**unmount cdrom
    umount /media/cdrom
--**eject cd
    eject <dev>
     find out dev by 
    eject -n
    
--**GRUB conf for CentOS

 default=0 timeout=10 splashimage=(hd0,0)/grub/splash.xpm.gz hiddenmenu
 title Red Hat Enterprise Linux AS (2.6.8-1.523)
  root (hd0,0)
  kernel /vmlinuz-2.6.8-1.523 ro root=/dev/VolGroup00/LogVol00 rhgb quiet 
  initrd /initrd-2.6.8-1.523.img
# section to load Windows 

title Windows
rootnoverify (hd0,0)
chainloader +1
 
--**Open Port 50000

	# vi /etc/sysconfig/iptables
 		-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 50000 -j ACCEPT
 	# /etc/init.d/iptables restart

 	# iptables -A INPUT -p tcp --dport 50000 -j ACCEPT
    # /sbin/service iptables save
	# /etc/init.d/iptables restart

	
--**change shell

	/home/sgill% chsh -s /bin/bash sgill
	Changing login shell for sgill.
	Password: 
	Shell changed.
	/home/sgill% 

	[sgill@centos ~]$ echo $SHELL
	/bin/bash
	[sgill@centos ~]$ chsh -s /bin/sh sgill
	Changing shell for sgill.
	Password:
	Shell changed.
	[sgill@centos ~]$
	
--**FTP install Centos 5.4
			yum install vsftpd
			vi /etc/sysconfig/iptables
			     -A RH-Firewall-1-INPUT -m tcp -p tcp --dport 21 -j ACCEPT
			service iptables restart
			service vsftpd start 
			       ?- or /etc/init.d/vsftpd start
		-test it as below
		     ftp localhost
		     	Connected to centos.
				220 (vsFTPd 2.0.5)
				530 Please login with USER and PASS.
				530 Please login with USER and PASS.
				KERBEROS_V4 rejected as an authentication type
				Name (localhost:root): sgill
				331 Please specify the password.
				Password:
				230 Login successful.
				Remote system type is UNIX.
				Using binary mode to transfer files.
				ftp>
				
--**USER management

		--User info
		--The id command prints information for a certain user. Use it like this:
		
		# id username
		--**Create a user
		--To create a new user:
		
		# useradd -c "My Example User" username
		# passwd username
		
		--The created user is initially in an inactive state. To activate the user you have to assign a password with passwd. Some useful useradd options include the following:
		-c : sets a comment for the user.
		-s : is used in order to define the user’s default login shell. If not used, then the system’s default shell becomes the user’s default login shell.
		-r : creates a user with UID<500 (system account)
		-d : sets the user’s home directory. If not used, the default home directory is created (/home/username/)
		-M : the home directory is not created. This is useful when the directory already exists.
		
		--To create a user that does not have the ability to login to a shell, issue the following commands:
		
		# useradd -c "This user cannot login to a shell" -s /sbin/nologin username
		# passwd username
		
		--Change the user’s password
		
		--To change a user’s password:
		
		# passwd username
		
		--If it’s used without specifying a username, then the currently logged in user’s password is changed.
		
		--Add a user to a group
		--Usermod is used to modify a user account’s settings. Check the man page for all the available options. One useful use of this command is to add a user to a group:
		
		# usermod -a -G group1 username
		
		--The -a option is critical. The user is added to group1 while he continues to be a member of other groups. If it’s not used, then the user is added only to group1 and removed from any other groups. So, take note!
		
		Remove a user from a group
		Removing a user from a group is a bit trickier. Unfortunately, there is no direct command, at least not in Fedora or RHEL, that can do that from command line. At first you need to get a list of groups that your user is a member of:
		
		# id -nG username group1 group2 group3 ....
		
		--Then you need to put all these groups as a comma-separated list to the usermod -G option, except for the group from which you want the user to be removed. So, to remove the user from group2, issue the command:
		
		# usermod -G group1,group3,... username
		
		--Lock and Unlock user accounts
		--Other common usermod uses are to lock and unlock user accounts. To lock out a user:
		
		# usermod -L username
		
		--To unlock the user:
		
		# usermod -U username
		
		--Delete a user
		--Userdel is used to delete a user account. If the -r option is used then the user’s home directory and mail spool are deleted too:
		
		# userdel -r username
		
		--Create a new group
		--To create a new group, issue the command:
		
		# groupadd groupname
		
		--The -r option can be used to create a group with GID<500 (system).
		
		--Change a group’s name
		--Groupmod can be used to change a group name:
		
		# groupmod -n newgroupname groupname
		
		--Delete a group
		--Groupdel can delete a group:
		
		# groupdel groupname
		
		--In order to delete a user’s primary group (usually this is the group with name equal to the username) the respective user must be deleted previously.
		
		--You can find more info in the man pages, but these will do in most cases.
		

--**Centos RSA
  ----Use Public/Private Keys for Authentication
	 
	Using encrypted keys for authentication offers two main benefits. Firstly, it is convenient as you no longer need to enter a password (unless you encrypt your keys with password protection) if you use public/private keys. Secondly, once public/private key pair authentication has been set up on the server, you can disable password authentication completely meaning that without an authorized key you can't gain access - so no more password cracking attempts. 
	
	It's a relatively simple process to create a public/private key pair and install them for use on your ssh server. 
	
	First, create a public/private key pair on the client that you will use to connect to the server (you will need to do this from each client machine from which you connect): 
	
	
	$ ssh-keygen -t rsa
	This will create two files in your (hidden) ~/.ssh directory called id_rsa and id_rsa.pub. id_rsa is your private key and id_rsa.pub is your public key. 
	
	If you don't want to still be asked for a password each time you connect, just press enter when asked for a password when creating the key pair. It is up to you to decide whether or not you should password encrypt your key when you create it. If you don't password encrypt your key, then anyone gaining access to your local machine will automatically have ssh access to the remote server. Also, root on the local machine has access to your keys although one assumes that if you can't trust root (or root is compromised) then you're in real trouble. Encrypting the key adds additional security at the expense of eliminating the need for entering a password for the ssh server only to be replaced with entering a password for the use of the key. 
	
	Now set permissions on your private key: 
	
	
	$ chmod 700 ~/.ssh
	$ chmod 600 ~/.ssh/id_rsa 
	 Copy the public key (id_rsa.pub) to the server and install it to the authorized_keys list: 
	
	
	$ cat id_rsa.pub >> ~/.ssh/authorized_keys
	Note: once you've imported the public key, you can delete it from the server. 
	
	and finally set file permissions on the server: 
	
	
	$ chmod 700 ~/.ssh
	$ chmod 600 ~/.ssh/authorized_keys
	The above permissions are required if StrictModes is set to yes in /etc/ssh/sshd_config (the default). 
	
	Now when you login to the server you won't be prompted for a password (unless you entered a password when you created your key pair). By default, ssh will first try to authenticate using keys. If no keys are found or authentication fails, then ssh will fall back to conventional password authentication. 
	
	Once you've checked you can successfully login to the server using your public/private key pair, you can disable password authentication completely by adding the following setting to your /etc/ssh/sshd_config file: 
	
	
	# Disable password authentication forcing use of keys
	PasswordAuthentication no
--**
	On linux box:
	1) log into the linux server with my user account
	2) run "ssh-keygen" which creates ~/.ssh/id_rsa and ~/.ssh/id_rsa.pub
	3) run "cat ~/.ssh/id_rsa.pub > ~/.ssh/authorized_keys"  ( name of file in sshd_config)
	
	Then copy ~/.ssh/id_rsa to Windows box via sftp, and :
	
	1) opened the id_rsa file in Puttygen, which prompted for the password I added during step 2 above.
	2) saved the private key file to my desktop as id_rsa.ppk 
	3) opened Putty, chose the id_rsa.ppk file under Connection > ssh > auth and connected to the server with my regular user account.
	
    Using username "sgill".
	Authenticating with public key "imported-openssh-key" from agent
	Last login: Fri May 27 12:48:43 2011 from 192.168.13.11
	[sgill@centos ~]$

		OR
		
	login as: sgill
	Authenticating with public key "imported-openssh-key"
	Passphrase for key "imported-openssh-key":
	Last login: Fri May 27 12:50:05 2011 from 192.168.13.11
	[sgill@centos ~]$

	
--**iptables location : /etc/sysconfig/
	
	# Firewall configuration written by system-config-securitylevel
	# Manual customization of this file is not recommended.
	*filter
	:INPUT ACCEPT [0:0]
	:FORWARD ACCEPT [0:0]
	:OUTPUT ACCEPT [0:0]
	:RH-Firewall-1-INPUT - [0:0]
	-A INPUT -j RH-Firewall-1-INPUT
	-A FORWARD -j RH-Firewall-1-INPUT
	-A RH-Firewall-1-INPUT -i lo -j ACCEPT
	-A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT
	-A RH-Firewall-1-INPUT -p 50 -j ACCEPT
	-A RH-Firewall-1-INPUT -p 51 -j ACCEPT
	-A RH-Firewall-1-INPUT -p udp --dport 5353 -d 224.0.0.251 -j ACCEPT
	-A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT
	-A RH-Firewall-1-INPUT -p tcp -m tcp --dport 631 -j ACCEPT
	-A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
	-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
	-A RH-Firewall-1-INPUT -m tcp -p tcp --dport 21 -j ACCEPT
	-A RH-Firewall-1-INPUT -m tcp -p tcp --dport 80 -j ACCEPT
	-A RH-Firewall-1-INPUT -m tcp -p tcp --dport 3306 -j ACCEPT
	-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
	COMMIT

--**Shortcuts
		AIX Control Book----http://unix.derkeiler.com/Mailing-Lists/AIX-L/2004-05/0234.html
		
--**AIX Health Check

		system details? #prtconf 
		hardware/software errors? #errpt
		filling file systems? #df
		failing hardware? #diag -s
		
--**LOGIN script
	Rename it back. Make sure it starts with
	#! /usr/bin/ksh
	or whatever your path to ksh is. Edit /etc/passwd to make the script the login shell. If that doesn't work, change .profile to one line:
	exec /path/to/script
	The second idea leaves a window. Until the shell runs that exec, a cntl-c is possible.

--**Cores -- cat /proc/cpuinfo | grep '^processor' | wc -l
--**cut
	-c [n | n,m | n-m] Specify a single column, multiple columns (separated by a comma), or range of columns (separated by a dash).
	-f [n | n,m | n-m] Specify a single field, multiple fields (separated by a comma), or range of fields (separated by a dash).
	-dc Specify the field delimiter.
	-s Suppress (don't print) lines not containing the delimiter.

	cut -c1-6 company.data
	cut -c4,8 company.data
	cut -d' ' -f2- test.txt 
	cut -f1-3
	cut -b1 
	
	Read more: http://lowfatlinux.com/linux-columns-cut.html#ixzz1To6RgOh4
	
--**paste

	$ ls | paste - -
	$ ls | paste - - -
	$ paste -s -d : f1.txt f2.txt
	$ paste -d"+-" fa.txt fb.txt fc.txt
	$ paste fa.txt fb.txt fc.txt | awk '{print "("$1"+"$2"-"$3")="$1+$2-$3}'
	$ < details.txt paste - - -

--**sort

	$ sort -t, -n -k3 file.txt
	$ sort -u
	$ ls -al | sort -n -k5
	$ ps auxw | sort
	$ ps auxw | sort -nk2
	$ ps auxw | sort -rnk2

--**EXPIRE password
	# usermod -p “” foo
 	# chage -d 0 foo
 	
 	# passwd -e foo
 	
--**array read vars from file
	You can encapsulate your variable extraction in a function and take advantage of the fact that declare creates local variables when used inside a function. This technique reads the file each time the function is called.
	
	readvar () {
	    # call like this: readvar filename variable
	    while read -r line
	       do
	               # you could do some validation here
	            declare "$line"
	       done < "$1"    echo ${!2}}
	       
	       
	Given a file called "data" containing:
	input[0]='192.0.0.1'
	input[1]='username'
	input[2]='example.com'
	input[3]='/home/newuser'
	foo=bar
	bar=baz
	
	You could do:
	$ a=$(readvar data input[1])
	$ echo "$a"
	username
	$ readvar data foo
	bar
	
	This will read an array and rename it:
	readarray () {
	    # call like this: readarray filename arrayname newname
	    # newname may be omitted and will default to the existing name
	    while read -r line    
	    do
	         declare "$line"
	    done < "$1"
	    local d=$(declare -p $2)
	    echo ${d/#declare -a $2/declare -a ${3:-$2}};
	    }
	    
	Examples:
		$ eval $(readarray data input output)
		$ echo ${output[2]}
		example.com
		$ echo ${output[0]}
		192.0.0.1
		$ eval $(readarray data input)
		$ echo ${input[3]}
		/home/newuser
	Doing it this way, you would only need to make one call to the function and the entire array would be available instead of having to make individual queries.

--**array note special variable #arrayname gives number of array elements
--**Read Text file into array
	----a sample from internet
		s=$(date +%s)
	    declare -a foo=( )
	    while read txt ; do
	            foo[${#foo[@]}]=$txt
	    done < my.txt
	    echo ${foo[0]}
	    e=$(date +%s)
	    echo $(( $e - $s ))
	    
	----read SQL from text file and execute with db2 - use array
	
		. /home/db2inst1/sqllib/db2profile
		declare -a fc=()
		file=my.txt
		
		echo
		echo Reading SQL commands from file . . .
		echo
		
		i=0
		while read line
		do
		fc[$i]=$line
		i=$[i+1]
		done < $file
		
		echo -e "\t\tRead $i lines from $file"
		echo
		echo
		        ## variable $i contains total # of array elements
		j=0
		while [ $j -lt $i ]
		do
		db2 -v "${fc[$j]}"
		j=$[j+1]
		done
		
		----Executing DB2 commands from SQL file . . .
		
			. /home/db2inst1/sqllib/db2profile
			declare -a fc=()
			file=my.txt
			
			echo
			echo Executing DB2 commands from text file . . .
			echo
			
			while read line
			do
			db2 -v "$line"
			i=$[i+1]
			done < $file
			
			exit 0
			
			
--**substring
#!/usr/bin/bash
name="Leonardo"
longitud=`expr length "$name"`
for i in $(seq 0 $longitud);
do
echo ${name:$i:1}
done


--**AIX io metrics
vmstat -Itw 2 4
iostat -DlT 2 4

--**DATE
--**Timestamp
--**TIME
	date "+%D"
	date "+%Y-%m-%d %H:%M:%S"
	date "+%F %T"
	date "+%T"
	eval "$(date "+year=%Y month=%m day=%d hour=%H minute=%M second=%S")"
--**scriptname
	scriptname=${0##*/}
	
	# ------------- SCRIPT ------------- #
	#!/bin/bash  
	echo
	echo "# arguments called with ---->  ${@}     " 
	echo "# \$1 ---------------------->  $1       "
	echo "# \$2 ---------------------->  $2       "
	echo "# path to me --------------->  ${0}     "
	echo "# parent path -------------->  ${0%/*}  "
	echo "# my name ------------------>  ${0##*/} "
	echo
	exit  

	
--**Links
	
	cd "$HOME/bin" &&
	for name in sleepy sneezy grumpy dopey
	do
	ln -s bashful "$name" ## you can leave out the -s option if you like
	done

--**ARRAY load from file

	IFS=$'\n' ## split on newlines, so each line is a separate element
	array=( $(cat "$kjv") )
	
--**CURSOR turn off

	## Turn off cursor
	printf "%s" "${CSI}?25l"

 	## Turn on
	printf "%s" "${CSI}0m"

--**SendMail

Subject: test
To: username@example.com

This is a test message.
Use sendmail to send the message: 

sendmail -t < message
In a script you could do something like this: 

(echo Subject: Your subject ; echo "" ; cat thefile ) | sendmail address@somewhere
(echo To: address@somewhere ; echo Subject: Your subject ; echo "" ; cat thefile ) | sendmail -t

#!/bin/sh
# This gives an example of sending an HTML message.
#
(
echo "From: myuser@example.com"
echo "To: sgill.dba@gmail.com"
echo "MIME-Version: 1.0"
echo "Content-Type: multipart/mixed;"
echo ' boundary="BOUNDARY"'
echo "Subject: Test Message"
echo ""
echo "This is a MIME-encapsulated message"
echo "--BOUNDARY"
echo "Content-Type: text/plain"
echo ""
echo "This is what someone would see without an HTML capable mail client."
echo ""
echo "--BOUNDARY"
echo "Content-Type: text/html"
echo ""
echo "<html>
<body bgcolor='black'>
<blockquote><font color='green'>GREEN</font> <font color='white'>WHITE</font> <font color='red'>RED</font></blockquote>
</body>
</html>"
echo "--BOUNDARY"
) | sendmail -t

----
	$ cat ./mailheader
	To: you@there.com
	From: me@here.com
	MIME-Version: 1.0
	Content-Type: text/html; charset=us-ascii
	Subject: Hello
	$ cat ./mailbody
	<center><h1>Hello</h1></center>
	Will this work?<br><b>Yes</b>
	$ cat ./mailheader ./mailbody | /usr/lib/sendmail -t


--**Make Temporary Filename
	tempfoo=`basename $0`
	TMPFILE=`mktemp /tmp/${tempfoo}.XXXXXX` || exit 1
	echo "program output"  $TMPFILE

--**Make Temporary Directory


--**tar
	Extracting the files from a tar file:
	
	tar -xvwf myfile.tar
	
	In the above example command the system would uncompress (untar) the myfile.tar file in the current directory.
	
	tar -xvwzf myfile.tar.gz
	
	In the above example command the system would uncompress (untar) the myfile.tar.gz file in the current directory.
	
	Note: There is no "untar" Linux and Unix command.

--**INFORMIX install ids 11.50
	groupadd informix
	useradd -G informix informix
	passwd informix
	
	./ids_install -console -javahome .jvm.bin


--**INFORMIX configure/start ids 11.50 

--**getopts example 
	aflag=
	bflag=
	while getopts ab: name
	do
	    case $name in
	    a)    aflag=1;;
	    b)    bflag=1
	          bval="$OPTARG";;
	    )   printf "Usage: %s: [-a] [-b value] args\n" $0
	          exit 2;;
	    esac
	done
	if [ ! -z "$aflag" ]; then
	    printf "Option -a specified\n"
	fi
	if [ ! -z "$bflag" ]; then
	    printf 'Option -b "%s" specified\n' "$bval"
	fi
	shift $(($OPTIND - 1))
	printf "Remaining arguments are: %s\n" "$*"

--**getopts example

	while getopts ":c:sd" Option
	# Initial declaration.
	# c, s, and d are the flags expected.
	# The : after flag 'c' shows it will have an option passed with it.
	do
	case $Option in
	# w ) CMD=$OPTARG; FILENAME="PIMSLogList.txt"; TARGET="logfiles"; ;;
	s ) PORT=20 ;;
	d ) DEBUG=true ;;
	c ) CMD=$OPTARG ;;
	* ) echo "Not recognized argument"; exit -1 ;;
	esac
	done
	shift $(($OPTIND - 1)) 
	
--**variable in variable	
# C1=abc
# x=1 
# echo $C$x
1
# eval echo \$C$x
abc

##==============================================string "<char>" <num> 
##--echos the string of so many (<num>) characters ("<char>")
string() { printf "******************************************\
*************************************************************\
*************************************************************\
**************************" | head -c $2 | tr '*' "$1";}
##==============================================
##------------HP-UX has different head syntax - tail is good instead, or maybe cut
##==============================================
string() { printf "kkkkkkkkkkkkkkkkkkkkkkkk" | tail -c $2 | tr 'k' "$1";}
string() { print "kkkkkkkkkkkkkkkkkkkkkkkk" | cut -c1-$2 | tr 'k' "$1";}
##--------------------------------------------cut needs EOL

--**trash
		rm -rf ~/.Trash/*
		
--**ps UNIX95
	UNIX95=1 ps -ef -o pid,sz,vsz,comm
	UNIX95= ps -o comm,sz,vsz,time,user,uid
	UNIX95= ps -e -o user,pid,pcpu,vsz,sz,tty,state,stime,time,args
	UNIX95= ps -e -o pcpu,cpu,ruser,args,pid 

	alias pcpu='UNIX95=1 ps -ef -o pcpu,user,pid,args | /bin/sort -u -r | sed -e '\''s/\.[0-9][0-9]/&\%/g'\'' | sed -n 1,15p'
Memory utilisation by processes – this can come also handy if you want to detect a memory leak:
	# UNIX95=1 ps -e -o vsz,pid,ppid,user,args | sort -rn | head
Checking CPU usage:
	# UNIX95=1 ps -ef -o pid,ruser,pcpu,args | sort -r -n -k3 | head
Printing the process tree (like ptree/pstree on other platforms): It is also possible to print an indented ps list, which is a tree-like structure to get a simpler overlook.
 # UNIX95=1 ps -efH | grep nfs | grep -v grep
	----script
		MYPROC=myprog
		PIDLIST=$(UNIX95= ps -C $MYPROC -o pid | grep -v PID)
		if [ $(echo $PIDLIST | wc -w) -lt 1 ]
		  then
		  echo $MYPROC is not running
		  exit 0
		fi
		
		if [ $(echo $PIDLIST | wc -w) -gt 1 ]
		  then
		  echo "$MYPROC has multiple copies running:"
		  ps -f -p ps -f -p $(echo $PIDLIST|tr -s " " ",")
		  exit 1
		fi
		
		kill -15 $PIDLIST
		if [ $(ps -p $PIDLIST > /dev/null) ]
		  then
		  kill -1 $PIDLIST
		    if [ $(ps -p $PIDLIST > /dev/null) ]
		    then
		    echo "$MYPROC (PID=$PID) will not terminate"
		    ps -f -p $PIDLIST
		    exit 2
		  fi
		fi
--**uptime
	
	#!/bin/bash
	# Set up limit below
	NOTIFY="6.0"
	FTEXT='load average:'
	
	# 15 min
	F15M="$(uptime | awk -F "$FTEXT" '{ print $2 }' | cut -d, -f3)"
	
	# compare it with last 15 min load average
	RESULT=$(echo "$F15M > $NOTIFY" | bc)
	
	# if load >= 6.0 create a file /tmp/file.txt
	if [ "$RESULT" == "1" ]; then
	        echo 'LOAD ISSUE'>/tmp/file.txt
	fi
	
--**unrar
--**rpm
--**wget
			wget http://dag.wieers.com/packages/unrar/unrar-3.6.2-1.el4.rf.i386.rpm
			rpm -Uvh unrar-3.6.2-1.el4.rf.i386.rpm
			unrar e -kb rarfile.rar
			
			# wget http://rarlab.com/rar/rarlinux-3.7.1.tar.gz
			# tar xvzf rarlinux*
			# cd rar
			# make
			# make install
			
			yum install unrar

			==OR==
			
			wget http://www.rarlab.com/rar/unrar-3.7.7-centos.gz
			gzip -d unrar-3.7.7-centos.gz
			chmod +x unrar-3.7.7-centos
			cp unrar-3.7.7-centos /usr/bin/unrar    # Need to do this as admin


--**tar compress logs weekly

		mkdir /dir/to/my/path/tmp
		
		for i in `find /dir/to/my/path -type f -mtime +10`
		do
		mv $i /dir/to/my/path/tmp
		done
		
		tar cvf /tmp/backup_file.tar /dir/to/my/path/tmp
		rm -r /dir/to/my/path/tmp
		

		
##==============================================read_ini_sec filename section [key] [var]
##--reads key=value pair from ini style text file. # is rem char for a line
##---- 1)  read_ini_sec <filename> <section> - reads all sectioned key=val pairs
##---- 2)  read_ini_sec <filename> <section> [key] - reads one sectioned key=val pair
##---- 3)  read_ini_sec <filename> <section> [key] [var] - reads one sectioned key=val pair into var
##----------------------------------------------
read_ini_sec() {
 filename=$1 ; section=[$2]; key=""; val=""; sstart=""; fword=""
	while read Line
	do 
		##-----read first word of line (fword)
		echo $Line | read fword
		##-----check if first word in non-null and first letter is "[" - termination of a section
		if [[ -n $sstart ]] && [[ "$(echo $fword |cut -c1 )" = "[" ]] ; then 
			    sstart=""
              fi 
		##-----while in section, read key=value as per parameters $3 and $4
		if [[ -n $sstart ]] && [[ -n $fword ]]  ; then
			echo $Line | read Line
			echo $Line | cut -c1 | read fchar
			if [[ "$fchar" != "#" ]]; then
			echo $Line | cut -d'=' -f1 | read key
			echo $Line | cut -d'=' -f2 | read val 
		 	if [[ -n $key ]] && [[ -n $val ]] && [[ $key = $3 ]] && [[ -z $4 ]]; then echo $val | read $key ; fi
			if [[ -n $key ]] && [[ -n $val ]] && [[ $key = $3 ]] && [[ -n $4 ]]; then echo $val | read $4 ; fi
			if [[ -n $key ]] && [[ -n $val ]] && [[ -z $3 ]]; then echo $val | read $key ; fi
			fi	 
		fi
		##-----signal start of section if fword equals section name enclosed in "[]"
		if [[ -n $fword ]] && [[ "$fword" = "$section" ]]; then
			   sstart=yes
      		fi
	done < $filename
}
##==============================================



--**AIX sendmail for simpler usage : send_email

#!/bin/ksh
##======================= send email========================
##--author	: sarbjit singh gill
##--date	: 2011-12-08
##--syntax	: send_email <email_ids> <subject> <body> [<attachment>]
##===========================================================
typeset os=$(uname -s )	#--OS name
rc=0
case $os in
  	HP-UX)
  		send_mail=/usr/sbin/sendmail
  		;;
  	*)
  		send_mail=/usr/sbin/sendmail
  		;;
esac
[[ -n $1 ]]&&[[ -z $4 ]]&&{(print "to:$1\nsubject:$2\n\n$3";) | ${send_mail} -t ; rc=$? ;}
[[ -n $1 ]]&&[[ -n $4 ]]&&{(print "to:$1\nsubject:$2\n\n$3";uuencode $4 $4;) | ${send_mail} -t ; rc=$? ;}              
exit $rc 
##===========================================================



--**AIX txtout -- Convert unix text files to dos or mac

##===================txtout <infile> [[<outformat>] <outfile>]
##--txtout reads unix text files writes 0-dos 1-unix-2-mac
txtout(){ typeset Line fmt ; fmt="\r\n";
[[ "$2" = "1" ]] && fmt="\n";[[ "$2" = "2" ]] && fmt="\r";
if [[ -z $3 ]]; then while read Line;do printf "${Line}${fmt}" ;done < $1 ;
else while read Line;do printf "${Line}${fmt}" >>$3; done < $1 ;
fi
}
##===================txtout


--**List open ports and listening services
lsof -i -n | egrep 'COMMAND|LISTEN'
netstat -a | egrep 'Proto|LISTEN'
netstat -an | egrep 'Proto|LISTEN'
netstat -lnptu


--**EXT Get extention

	case "${x##*.}" in
	     gz)
	           gzunpack ${SROOT}/${x}
	           ;;
	     bz2)
	           bz2unpack ${SROOT}/${x}
	           ;;
	     *)
	           echo "Archive format not recognized."
	           exit
	           ;;
	esac                                      

--**NETWORK Centos 6.2

Configure eth0:
	vi /etc/sysconfig/network-scripts/ifcfg-eth0
	
	DEVICE="eth0"
	HWADDR="00:0C:29:67:51:B1"
	NM_CONTROLLED="yes"
	ONBOOT="yes"
	IPADDR=192.168.1.44
	BOOTPRO=static
	NETMASK=255.255.255.0
	
Configure Default gateway:
	vi /etc/sysconfig/network

	NETWORKING=yes
	HOSTNAME=centos6.2
	GATEWAY=192.168.1.1

Restart Network interface:
	Service network restart


Configure DNS server:
	 vi /etc/resolv.conf

	nameserver 8.8.8.8
	nameserver 192.168.1.1
 
---- minimum (dhcp)
		network
		
			NETWORKING=yes
			HOSTNAME=Centos64
			
		ifcfg-eth0
		
			DEVICE="eth0"
			HWADDR="08:00:27:F0:01:0E"
			NM_CONTROLLED="yes"
			ONBOOT="yes"
			TYPE=Ethernet
			BOOTPROTO=dhcp