Microsoft DOS sys command
Sys is used to copy the system files from one drive to another drive, allowing that drive to be bootable.
When running sys, the below files will be copied.
The sys.com command is an external command and is available in
Copies MS-DOS system files and command interpreter to a disk you specify.
SYS [drive1:][path] drive2:
|[drive1:][path]||Specifies the location of the system files.|
|drive2:||Specifies the drive the files are to be copied to.|
If you type this from c drive and you have a formatted disk in the drive, this would copy the system files to that disk making that disk bootable.
The sys.com file must be ran on the drive that contains the system files and the sys.com file. If you're running from the hard drive this command is commonly located in the C:\Windows\COMMAND\ directory on Windows 95, 98, NT, and 2000 or in C:\DOS\ directory on Windows 3.x / DOS. This command can also be ran from a bootable diskette assuming all the necessary files are on that diskette.
If, when booting your computer, you get "Missing command interpreter", this could be an indication of missing command.com. To resolve this issue, boot from a disk that has sys.com and command.com on the disk, type sys c: from the A:\>, remove the disk and reboot the computer.