Shell 命令从 Java 失败，但在手动运行时有效

Question

I'm trying to run some bash commands that works fine from my console but fails when trying to make the same command call from within Java. The command returns no errors and fails to produce the desired output file. The command is suppose to use a PGP tool (GPG) to decrypt aa file and create another file. This works when run manually but not from within a java app making the same shell call and with no errors.

Just to be sure I even tried chmod 777 on the container folder so I don't think its a permission issue.

Shell Executor Code (Courtesy of Mkyong.com)

private static String executeCommand(String command) {

    StringBuffer output = new StringBuffer();

    Process p;
    try {
        p = Runtime.getRuntime().exec(command);
        p.waitFor();
        BufferedReader reader =
                new BufferedReader(new InputStreamReader(p.getInputStream()));

        String line = "";
        while ((line = reader.readLine())!= null) {
            output.append(line + "\n");
        }

    } catch (Exception e) {
        e.printStackTrace();
    }

    return output.toString();

}

Actual Shell Command

gpg --output /main/decrypted-token.txt --passphrase test /main/token.asc

Answer 1

If the command works fine on the terminal but not when calling from the Java script, the first thing I would try would be to specify Bash on the command being called, see if this works:

bash -c "gpg --output /main/decrypted-token.txt --passphrase test /main/token.asc"

Or even better:

/bin/bash -c "gpg --output /main/decrypted-token.txt --passphrase test /main/token.asc"