We saw in the first chapter that it is possible to shell out of the console REPL to the operating system by using the ; command. In addition, Julia provides a number of built-in functions so that scripts can interactive with the OS and its filesystem. Most of these commands mirror the standard Unix commands. For Windows users, they will be familiar to those who have used the MINGW or similar shells.

Two familiar ones are pwd() and cd():

julia> pwd();
"/Users/malcolm/Packt/Chapter-4"
julia> cd("../../Work");
julia> pwd();
"/Users/malcolm/Work"

The pwd() command indicates where we are now (print working folder), and of course, cd() is used to change the folder. This can be relative to the current location or an absolute if the file specification starts with /.

It is also possible to create new folders with mkdir() subject to your access permissions. Files may be copied cp(), moved mv(), or deleted rm().

Folders are also deleted using the rm() command, which has a...