Fixing local and remote computer problems.
Checking to make sure no virus/ malware/ spy ware are on the computer and if there are, stopping and deleting them.
Destroying computers that do not belong to you.
Shutting down websites and servers that do not belong to you.
In addition to these there is almost an infinite number of things that you cant do because they are Illegal in some way shape or form.
In conclusion it may be illegal to use command prompt depending on what you are doing with it.
If you remember one thing from this article remember that, yes it is legal to use, but you cant damage property that you do not own.
EDIT:
No, its not illegal. Its just a software tool, like Microsoft Word etc. Keep in mind that Command Prompt is a shell of MS-DOS which was a OS made by Microsoft (same guys which make Windows), and so it can't be illegal to use. They do put in there for a reason.
But, like with any software, you could get prosecuted if you use the software for the harm of another person. Same goes for learning a programming language.
when using command prompt, after you give it a command, press the enter button. Command prompt will then carry out the task and will automatically go to the next line.
Its not possible from DOS Prompt..
You can do it by using "chkdsk" command.
You can start registry editor using command prompt by using "regedit" command. You can also use registry tools such as "regedit /restore" or "regedit /fix" etc.
Run program.exeorthe name of the program, with or without .exe (if the command prompt is in the same directory/folder of the executable)
Just run "regedit" command from DOS..
compact
use the netstat command.
The command prompt is a terminal window, and allows the user to control their computer using specific commands. Command line recovery tools include ddrescue and the ntfs* family of tools.
Use "prompt $p$g" command.
Safe mode with command prompt option is totally depends on DOS shell, hence there is no need for separate command prompt..
PROMPT command is an internal command, which is used to change the MS-DOS prompt. Through, the system displays the prompt bu default, when you start the computer.