2 - Raspberry PI Community Projects

$ pwd
/home/rhertzog
$ cd Desktop
$ pwd
/home/rhertzog/Desktop
$ cd .
$ pwd
/home/rhertzog/Desktop
$ cd ..
$ pwd
/home/rhertzog
$ ls
Desktop Downloads Pictures Templates
Documents Music Public Videos
A new directory can be created with mkdir directory, and an existing (empty) directory can
be removed with rmdir directory. The mv command allows moving and/or renaming files and
directories; removing a file involves rm file.
$ mkdir test
$ ls
Desktop Downloads Pictures Templates Videos
Documents Music Public test
$ mv test new
$ ls
Desktop Downloads new Public Videos
Documents Music Pictures Templates
$ rmdir new
$ ls
Desktop Downloads Pictures Templates Videos
Documents Music Public test
B.1.2. Displaying and Modifying Text Files
The cat file command (intended to concatenate files on its standard output) reads a file and
displays its contents in the terminal. If the file is too big to fit on a screen, use a pager such as
less (or more) to display it page by page.
The editor command always points at a text editor (such as vi or nano) and allows creating,
modifying and reading text files. The simplest files can sometimes be created directly from the
command interpreter thanks to redirection: echo "text" >file creates a file named file with
“text” as its contents. Adding a line at the end of this file is possible too, with a command such
as echo "line" >>file.
438 The Debian Administrator's Handbook