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 ...

Shell basics The Unix command line shell is roughly equivalent to the command window in Microsoft Windows (cmd or PowerShell). The commands we walk through below will work on any Unix-like system ...

If you're new to the UNIX operating system, especially if you're familiar with Windows, you'll find that the file access control mechanisms might not be exactly what you expect.