How to pass variables from Java to shell commands

Question

I am using process builder to execute multiple shell commands (not external shell script) from Java. I can pass system environment variables to the shell command; However, if I want to pass on a variable defined in java (for example a string) as a argument to the shell command, how can I do that? My code looks something like this. I want two files to be created (touched) by name 123 & 234.

public class ExecShellCmds {

public static void beginWrite() {
    String var1 = "123";
    String var2 = "234";

    String s = null;
    try {
        String[] cmd = {"/bin/bash", "-c",
            "touch var1;"
            + "touch var2;"
        };

        Process p = Runtime.getRuntime().exec(cmd);
}}

Look here. I think this would be usefull: [Pass variable to shell](http://stackoverflow.com/questions/23906717/pass-a-variable-from-java-to-a-shell-script) — Jonathan Fuchs, Jun 22 '16 at 13:37
If you show us the code you have, we can guide you in the right direction. — Jaroslaw Pawlak, Jun 22 '16 at 13:37
I do not want to run external script but would like to directly call multiple commands from with in java code — Karthik, Jun 22 '16 at 14:10

score 0 · Answer 1 · answered Jun 22 '16 at 13:37

0

The arguments (and the program) are stored in a List<String>, you can get a reference to this list with ProcessBuilder.command(), you can then just add your parameters to this list.

answered Jun 22 '16 at 13:37

tkausl

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How to pass variables from Java to shell commands

1 Answers1