multiple jar files in a bash script

Question

So I have a jar file that I need to run five times with a ./run.sh script.

So I put the jar fle back to back in the script 5 times.

#!/bin/bash
java -jar lol.jar
java -jar lol.jar
java -jar lol.jar
java -jar lol.jar
java -jar lol.jar

And it didn't work. The java files launch one after the other when I terminate the previous.

So how do I run 5 instances of the same jar at the same time?

I was thinking I could have 5 different .sh scripts and run them all with a 6th one. How do I do that? example please. Thank you!

Related? [Running a Jar twice](http://stackoverflow.com/q/10256395/1983854) — fedorqui, Jun 13 '16 at 10:33
Use something like `java -jar lol.jar & java -jar lol.jar & ...`. See [Execute several programs at the same time in an initialisation/bash script](http://stackoverflow.com/questions/430176/execute-several-programs-at-the-same-time-in-an-initialisation-bash-script) — Jesper, Jun 13 '16 at 10:35

score 4 · Accepted Answer · answered Jun 13 '16 at 10:36

4

You can try to run your java processes as deamons

You can daemonize any executable in Unix by using nohup and the & operator:

#!/bin/bash
nohup java -jar lol.jar &
nohup java -jar lol.jar &
nohup java -jar lol.jar &
nohup java -jar lol.jar &
nohup java -jar lol.jar &

answered Jun 13 '16 at 10:36

Lorenz Pfisterer

there's a problem, like, there are options java jar lol.jar -a dsads -b adsa -c sdasd. edit: nvm it worked! – Web Master Jun 13 '16 at 10:41
3

That isn't running anything as a daemon. – 123 Jun 13 '16 at 10:43
per definition daemon means background process. A & (an ampersand) at the end of the command means that the process is executed in background – Lorenz Pfisterer Jun 13 '16 at 10:57
anyway to add a 5 second delay between each client launch – Web Master Jun 17 '16 at 14:11
add the following line after each java command line: sleep 5 – Lorenz Pfisterer Jun 22 '16 at 13:28

score 3 · Answer 2 · answered Jun 13 '16 at 10:45

3

Multiple ways:

Why don't you write java threaded program.
Append '&' at each line as follows. It runs your command in background. java -jar lol.jar &

Next you can use following to make comma separated list of Process Ids for further control over running jars.
PIDs=${PIDs},$!
Use '&' and loop for i in {0..5}; do java -jar lol.jar & ; done

answered Jun 13 '16 at 10:45

Rohit Verma

I tried the & but without the nohup only 1 client would launch and not all of them. – Web Master Jun 17 '16 at 14:10

2 Answers2