To execute a unix command (e.g. ``ls *.dat'') without having to quit soas, you can type ``sys ls *.dat'' after the soas prompt. It works with any unix command, just type ``sys''+ space+ command. AVOID removing files that way, since no confirmation would be required before irreparable deletion of files, even if you've redefined ``rm'' as ``rm -i'' !!! Typing ``sys rm *'' would delete irreparably all the files in the directory.
Confirmation is required.