Java中的sshpass给出错误：/ bin / sh：sshpass：找不到命令

Question

I'm trying to execute a simple sshpass command in java:

String command = "sshpass -p password ssh user@host 'echo test' ";

ProcessBuilder pb = new ProcessBuilder("/bin/sh", "-c", command);
pb.inheritIO();
Process process = pb.start();
process.waitFor();

But the execution of command fails printing the following error on the console:

/bin/sh: sshpass: command not found

If I execute the command in the Terminal od my Mac OS, the command runs perfectly. (already installed sshpass via brew).

How to execute the command also in java?

Answer 1

Thanks to @Thorbjørn Ravn Andersen, this is the right command (for Mac):

String command = "/usr/local/bin/sshpass -p password ssh user@host 'echo test' ";

You can find the right path executing the following command:

$ which sshpass

Answer 2

This is actually a Unix thing, not Java. There are two things here:

• By not giving the absolute path to sshpass , you rely on the shell to find it in $PATH
• You explicitly start a new shell, which - as it is non-interactive - does not load all the configuration files your interactive shell did. If the adding of /usr/local/bin to $PATH is not placed in an appropriate configuration file it will not be executed. Full details available in the shell manual page.

By giving the absolute path you circumvent the lookup mechanism!