Option clustering

Option clustering for unix-type flags is supported.

Assume that mode flags -x and -z are defined, as well as a unary option -f. Then the following is valid input:

tar -xzf file.tgz

which is shorter than having to type out each option name in full:

tar -x -z -f file.tgz

The "attached" style of passing the file argument also works:

tar -xzffile.tgz

but please note that = is not part of the syntax. The following passes =file.tgz as the file name, which might not be what you want:

tar -xzf=file.tgz

Set @Command(unixClustering = false) to disable unix clustering.