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Operating System Application Lab
2014-2015
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What is OS?Software of a computer, that schedules tasks, allocates storage, and presents a default interface to the user between applications .
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DOSDisk Operating SystemIs a CLI (Command Line Interface)The command line begins with a prompt
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Pathnames• The name you give to a directory or file when you create it is not its full name.• The full name of a directory is its pathname.
Pathnames may be:– absolute: is the complete pathname of a file or directory beginning with the root directory.– relative: begins from your working directory; it is the path of a file relative to your working directory.• working directory: is the one you are currently operating in.
if chris is your working directory– relative pathname for the file monday isreports/monday– The absolute pathname for monday is/home/chris/reports/monday.
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Open Command Screen•Start -> Run -> Write CMD
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Disk Drive• PC can have one or more hard disk drives.
• The advantage of a hard disk▫ it can store large amounts of data which can be
accessed relatively quickly
• hard disk called in PC: C , and may also called D
• Example: c:\Users\HP>; ▫ C is hard disk, Users folder inside C and HP
inside Users
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Change disk drive•To change the default drive, type the
desired drive letter followed by a carriage return.
•Example:▫type-> d:
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Directory commands •dir command:
▫display a listing of the files on the default drive (a directory).
•Example
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Directories 2•To list the files on another drive, type:
D:> dir c:
•Example
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cd command•cd refers to change directory
•example:▫cd fold▫cd .▫cd ..▫cd /
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•To create a subdirectory named fold, type:▫mkdir fold or md fold
•To remove directory names fold, type:▫rmdir fold or rd fold
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WILDCARDSWildcards are characters that can be used to stand-in for unknown characters in file names.
• * = matches up with any combination of allowable characters▫Ex: c:\>del *.doc
• ? = matches up with any single allowable character.▫Ex: C:\>del ?.doc
Not allowable in specifying filenames, but very useful in any DOS command which uses a filename as an argument.
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Files commands •Creating new files :
▫copy con filename <press enter> Fill the file then press ctrl + z
•Deleting files▫del filename
•Displaying contents•type filename
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Copying files•command:
▫copy oldfile newfile
▫oldfile express the source where file come from
▫newfile express the destination where file go to
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Dirictory + files commands•Rename
▫Rename oldname newname
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Other commands•Displays DOS Help
▫ help command
•CLS▫ Clear the screen
•Date•Time•EXIT
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