I have written a script in which I want that if a condition is true the script should execute the loop and after executing it should evaluate the condition oncve again and repeat the execution of loop unless the condition is false.I am giving an example below,Please help.

`echo "cd /home/xmuser/CQ/var/bin"`
`echo ". ./xmenv.ksh"`
`echo "ftfping"` >ftfping.txt
var=`echo "more ftfping.txt" |grep SUCCESSFUL |wc -l`
if [[ $var -ne 1 ]]; then
sleep 30 |./xmstop.ksh
for PIDs in `ps -eaf |grep -E "xmuser|run.sh" | grep -E "xmocoord|/home/xmuser/|/home/db2inst1/|Coordinator|xmo" |awk '{print
$2}'`
do
kill -9 $PIDs >junk
done
var=`echo "more ftfping.txt" |grep SUCCESSFUL |wc -l`
fi


I want to execute the if loop till teh condition is false but the loop is being executed only once.Please advice...........

I'm no scripting expert but....
The only condition test I see here is the "if" statement, which is not in the loop. The loop simply runs as long as there are entries in whatever is generated by the statement `ps -eaf.........2{'`
You might want to test this statement by itself to make sure it is producing what it is supposed to.

Other issues:
What output does "sleep 30" generate? (You are using a pipe, which presumes there is an output to be piped to the next command.)

Why the backticks here?: 2 problems here: First, this will produce literally the string in the double-quotes. Second if you intended to have the output of the more command, then how would the paging for "more" be done? (ie, I'm not sure if you can really use "more" in a script.)

ok,Can u please suggest how to put the if condition in loop?

Ummm---you would put it inside the loop....ie between the "do" and "done" statements.

But--if you want a loop which simply executes until a condition is no longer true, then you need "while" or "do-while". For good tutorials and books on scripting, go to http://tldp.org

You might want to write your script in "pseudo-code" to help us see the logic you are trying to implement