Following is my script, every time I run this it goes into else part. when I run the TEST2EVAL command it gives me 1
#!/bin/sh
TEST2EVAL='ps auxf | grep some.jar | grep -v grep | wc -l'
if [ "$TEST2EVAL" = 1 ]
then
java -jar /path/to/jar &
else
echo "Running"
fi
Assuming you are trying to find out if any processes are running with some.jar on their command lines you probably want:
if pgrep -f some.jar; then
echo running;
else
echo not running;
fi
java process using that jar. Anything touching that jar (or any other file with the same name) will trip that "already running" detection.In in order save the output of a command in a variable, you have to enclose the command in backticks (`), not single quotes ('). Thus, change the second line of your script to:
TEST2EVAL=`ps auxf | grep some.jar | grep -v grep | wc -l`
You are using the wrong quotes for command substitution: not single quotes:
TEST2EVAL='ps auxf | grep some.jar | grep -v grep | wc -l'
but backquotes:
TEST2EVAL=`ps auxf | grep some.jar | grep -v grep | wc -l`
Better yet, use TEST2EVAL=$(ps auxf | grep some.jar | grep -v grep | wc -l) instead. It's much clearer, supported by all POSIX-compatible shells, and can be nested more easily when necessary.
