How to Execute a File in a MacBook Terminal. The operating system your MacBook runs, OS X, is built on top of UNIX, and Terminal provides you with access to the underlying UNIX system commands ...

The Linux umask setting plays a big role in determining the permissions that are assigned to files that you create. But what’s behind this variable, and how do the numbers relate to settings ...

As with many things on the Linux command line, you have some choices on how you make your requests. The chmod command allows you to change permissions numerically or using character expressions.

The command to address this issue is “chmod”. There is more than one way to change permissions, but I prefer the OCTAL code method. This method can be memorized easily using the following table.

I often profess that Linux can be used without the command line, but at some point, you might want to learn it anyway. When you do, consider these commands.