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Editorial Team
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Asked: 2026-06-01T16:46:09+00:00

I’m writing a Java program MyAwesomeProgram that uses Process’ exec function to run bash

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I’m writing a Java program MyAwesomeProgram that uses Process’ exec function to run bash commands locally. My code is located in /home/a/b/c, and there are .sh files located in /home/a/b/d that I need to run. However, when I run my code:

Process p;
Runtime rt = new Runtime.getRuntime();
p = rt.exec("./home/a/b/d/shell.sh");
p.waitFor();

I receive an error:

Exception in thread "main" java.io.IOException: Cannot run program "./home/a/b/d/shell.sh": java.io.IOException: error=2, No such file or directory
at java.lang.ProcessBuilder.start(ProcessBuilder.java:460)
at java.lang.Runtime.exec(Runtime.java:593)
at java.lang.Runtime.exec(Runtime.java:431)
at java.lang.Runtime.exec(Runtime.java:328)
at MyAwesomeProgram.main(MyAwesomeProgram.java:186)
Caused by: java.io.IOException: java.io.IOException: error=2, No such file or directory
at java.lang.UNIXProcess.<init>(UNIXProcess.java:148)
at java.lang.ProcessImpl.start(ProcessImpl.java:65)
at java.lang.ProcessBuilder.start(ProcessBuilder.java:453)

I believe this is just a mistake in formatting the exec command String, however I haven’t been able to find a solution thus far. Where have I messed up? Any other tips/tricks for using exec effectively would be appreciated, but completely optional. Thanks!

Edit: I got the code working, it was an issue with a couple directory references I got backwards as well as what Woot4Moo said.

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1 Answer

  1. Editorial Team

    well if your program lives in: 

    /home/a/b/c

    and your scripts live in: 

    /home/a/b/d

    and you use the . you are not in the right directory. You want to exec it with the following path: 

    ../d/script.sh

    The . says use the current directory + your string. So in essence your input is the following: 

    /home/a/b/c/home/a/b/d

    The .. allows you to go up one directory which if you are at : 

    /home/a/b/c

    you want then arrive at: 

    /home/a/b
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