by using "clrscr" command at starting of the program
It depends. If you are using a Windows Command Prompt, the command is "cls". If you are using a Mac or Unix distribution, the command is usually "clear". Other than that, I would restate the question, specifying the OS and hardware you are using.
KAIMAN
It's more appropriate to answer what files can be executed from the command line.You can execute .exe, .com and .bat files and you can open files using their associated program by typing their name.
To delete all files from a diskette, you can use the command DEL *.* in the command prompt, which removes all files in the current directory. If you want to delete files without being prompted for confirmation, you can use DEL *.* /Q. Alternatively, you can format the diskette using the command FORMAT A: (assuming A: is the drive letter), which will erase all files and prepare the diskette for new data.
All files in a directly can be copied without copying the sub directories using FTP by first highlighting them. This allows a user to specifically select only the files they want to transfer. If you are doing this via the command line interface using the mget command with a mask (such as *) will transfer all files except subdirectories.
Using man ls will open the manual page for the ls command. The ls command lists the files and folders in the current directory.
To take a clear picture of a computer screen using your phone, make sure the screen is clean and free of glare. Hold your phone steady and adjust the focus until the screen is clear in the camera viewfinder. Avoid using the flash to prevent glare and reflections. Consider using a tripod or stabilizing your hand to reduce blurriness. Experiment with different angles and distances to find the best shot.
clear banner motd ^^^ I believe that command is wrong. It should be "no banner motd", if your using the cisco command line.
Dos commands are used to create or delete directories. The ATTRIB Command is used for locking and unlocking of files.
The Linux operating system command gunzip does many things. The main thing that gunzip does it compress files so that they are smaller and easier to upload and download.
You turn of the Functions axes so you a completely clear graph screen. Then, you use the pt-change command to create your image. You can then use the StorePic command to store your image to Pic variable, which can be sent to a computer or recalled using the RecallPic command.