Disk Operating System (DOS) Question: Download DOS (Disk Operating System) PDF

While working with MS-DOS which command is used to change the extension of all filenames ending with .txt to .doc?

a. Ren .doc .txt
b. Ren .txt .doc
c. Ren file.doc file.txt
d. Ren a: .doc .txt

b. Ren *.txt *.doc

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Which of the following file names are invalid in MSDOS? a. MYFILE.DOS b. CHECK$.(1) c. Verified.### d. Qwerty.1?3	While working with MS-DOS which command is used to combine file1 plus file2 into new file named file3? a. Copy file3 file1+file2 b. Copy file1+file2 file3 c. Copy file1+file2+file3 d. Copy file2 file1+file3