The "mv" utility can perform two functions.
First, it will move a file from one location to another such as
in the following case in which the file.txt is moved one directory up
mv file.txt ../
However, if you specify a name other
than the name of the file, it will move the file AND rename it. Thus,
to rename a file you simply move it to the same directory but
use a new name such as
mv file.txt new_name.txt
Moving is useful because instead of copying a file (which leaves two versions of the
file to take up disk space and introduce confusion), the mv utility makes
sure that there is only one copy.
The mv follows the standard syntax of:
mv [option] file1 file2
mv [option] space_delimited_file_list directory_name
There is only one option, the -f option which overwrites the existing file
regardless of the permissions.