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Top Forums Shell Programming and Scripting Exit for loop in a shell script if a condition is successfull Post 302314780 by usha rao on Sunday 10th of May 2009 07:09:54 AM
Old 05-10-2009
Data Exit for loop in a shell script if a condition is successfull

Hi All,
I am stuch in a script where a for loop is running to execute some commands for some values.
Now my problem is i have to have an if condition that if the first iteration is successful then it has to exit the for loop otherwise it has to continue normally.

my code is this:

Code:
 
for jvm in `cat /tmp/highcpu | awk -F" " '{print $3}' | sed 's/Cl/\/Cl/g'`;do
for val in `cat /tmp/thrd_id`;do
cd /logs/$jvm
echo "Thread location is $jvm and thread id is $val" >> /tmp/thread_causing_problem
cat websphere_stdout.txt |sed -n "/$val/,/\"/p"  >> /tmp/thread_causing_problem
done
done


What i have tried so far is

Code:
 
for jvm in `cat /tmp/highcpu | awk -F" " '{print $3}' | sed 's/Cl/\/Cl/g'`;do
for val in `cat /tmp/thrd_id`;do
cd /logs/$jvm
echo "Thread location is $jvm and thread id is $val" >> /tmp/thread_causing_problem
cat websphere_stdout.txt |sed -n "/$val/,/\"/p"  >> /tmp/thread_causing_problem
if [ $? -eq 0 ]; then
exit 1;
fi
done
done


but it is not working.

I have other way
like this
Code:
if [ !-s /tmp/thread_causing_problem ] ; then

but this will not help as the line
Code:
echo "Thread location is $jvm and thread id is $val"

will execute even if

Code:
cat websphere_stdout.txt |sed -n "/$val/,/\"/p"  >> /tmp/thread_causing_problem

will not return any value.

My requirement is the for loop should execute only once if for the first iteration
Code:
 
cat websphere_stdout.txt |sed -n "/$val/,/\"/p"  >> /tmp/thread_causing_problem

the above line produces an out put.
If the above line produces an output for the first iteration then there is no need of doing further iteration and it should exit the for loop else it should continue executing the loop.

Can anyone help??

Thanks in advance
 

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