Shell (bash) brace expansion with Java's runti

问题:

I'm trying to get an expansion command to work with runtime.exec, but the braces are being interpreted as literals rather than being expanded. Here's what I'm trying to do:

String command = "mkdir -p Foldername{1,2,3}/InnerFolder";
Runtime.getRuntime().exec( new String[] { "sh", "-c", command } );

Unfortunately, that gives me a single folder in my current directory named "Foldername{1,2,3}" instead of "Foldername1", "Foldername2", and "Foldername3". Does anyone know of a way to prevent the braces from being interpreted as literals?

回答1:

You're trying to use Bash wildcards. They are interpreted within the Bash shell. You are running mkdir directly, so there is no shell to interpret {}. You need to specify path to the shell

String command = "mkdir -p Foldername{1,2,3}/InnerFolder";
Runtime.getRuntime().exec( new String[] { "/bin/bash", "-c", command } );

Source.