These are the formal rules for forming basic UNIX regular expressions. For some simple examples, skip to Simple Examples. The rules come from the Solaris 7 regexp(5) manual page. The I2A2 reflector ...

I'm posting this here because OS X is my main unix system, though I also use some linux stuff (synology and a ubuntu virtual machine in my mac). I've dabbled with unix off and on for more than 20 ...

Providing only the basic commands that jailed users need is not quite enough, however. While it might not be obvious, most basic Unix commands are incomplete in themselves.