What is the purpose for using file-manipulation tools with the CLI?

[sharee]

What is file-manipulation tool used for on the Linux command line?

[coopstah13]

to manipulate files from the command line

[jayd512]

Unless you have a different meaning behind your question...
Yeah, coopstah said it.

[hazel]

If you mean why should you do it instead of using nautilus or the like, the answer is simple: it's much much faster.

[linxt]

Also, it gives you a way to make repairs if something happens to the X-server, a backdoor to view, move, or edit files when you can't use the desktop.

[Dapper Dan]

The engine stops running and you need to know what the problem is. Unlike Windows which has the hood welded shut, you're actually allowed to open the hood and investigate the matter for yourself. With a little expertise, you can clear that fuel line and get your engine going again.

[alf55]

If you mean why should you do it instead of using nautilus or the like, the answer is simple: it's much much faster.

Lilke you downloaded images from your camera and they are "*.JPG" but you prefer "*.jpg" instead. Simple command line change:

for f in *.JPG; do mv ${f} ${f%JPG}jpg; done

And yes using the command line is much much faster.