Assigning variable in shell script

Question

#!/bin/sh
SUCCESS=0 
java -jar sbc.jar &
while [ true ];
do
echo "sleeping"
sleep 5
echo "again"
tail -1 ~/NetBeansProjects/xyz/dist/newlog.log | grep -q "[INFO ] - Stream closed"
if  [ $? = 1 ]
then
echo " entered if "
java -jar sbc.jar &
else 
echo " did not if "
fi
done

I want to use a better variable than $? to store the result of the previous line because I may need it more than once. The script is intended to check the last line of the file newlog.log for a particualr string and then start sbc.jar again because the string confirms that the program has stopped.

John Keyes · Accepted Answer · 2011-10-01 10:58:39Z

1

Store it in another variable:

...
tail -1 ~/NetBeansProjects/xyz/dist/newlog.log | grep -q "[INFO ] - Stream closed"
RES=$?
if  [ $RES = 1 ]
...

answered Oct 1, 2011 at 10:58

John Keyes

5,6142 gold badges33 silver badges51 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

R1234 Over a year ago

Thanks. I was giving a space after RES earlier which was making it an unknown variable. Whitespaces are an issue with shell scripting :P . Thanks a lot :)

John Keyes Over a year ago

You're welcome. I often made that mistake. The other most common one for me was not leaving a space after [ and before ] for conditionals. Please accept this answer to save other people time.

R1234 Over a year ago

that I figured out yesterday :D

R1234 Over a year ago

I would have accepted it. It was showing 5 minutes are too less to accept. Done now! :)

Collectives™ on Stack Overflow

Assigning variable in shell script

1 Answer 1

4 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Your Answer

Sign up or log in

Post as a guest

Related