External DOS Commands:

Those commands which are not included in COMMANDCOM file and which reside on the system disk are the external commands. The system disk must be in the same drive to work with external DOS commands.

Sn. Command Switch Function Syntax 1. CHKDSK To check drive, directories, files etc. Drive: Path\CHKDSK /F Fix errors C:CHKDSK/F /V Display name and path. C:CHKDSK/V 2. SCANDISK To check disk status and fix errors. Drive: Path\SCANDISK C:SCANDISK 3. LABEL Change Volume label. Drive: LABEL {Drive}{label} C:LABEL A: ram 4. FORMAT To Format Disk. Drive: FORMAT {Drive} {Switch} C:FORMAT A: /V Specify volume label. C:FORMAT A: /V /Q Quick format C:FORMAT A: /Q /S System Transfer C:FORMAT A: /S 5. DISKCOPY To copy disks. Drive: DISKCOY {Source drive} {Target drive} 6. SYS To transfer system files. Drive: SYS {drive} C:SYS A: 7. TREE To display directories and files. Drive: TREE C:TREE 8. XCOPY To copy directories with sub directories from another location. Drive: XCOPY {Drive/Path} C:XCOPY  A:ram 9. MORE To view files page by page. Drive: {Drive: | more} C:Dir |MORE 10. DELTREE To delete directory with contents. Drive: DELTREE {Directory} C: DELTREE ram 11. DISKCOMP To compare disk. Drive: DISKCOMP {Disk1} {Disk2} C: DISKCOMP A: A: 12. EDIT To open Edit screen. Drive: EDIT {filename} C: EDIT ram 13. ATTRIB To change attribute of the file. Drive: ATTRIB {switch} {filename} +A Apply Archive C: ATTRIB +A ram -A Remove Archive C: ATTRIB -A ram +R Apply Read only C: ATTRIB +R ram -R Remove Read only C: ATTRIB –R ram +H Apply Hidden C: ATTRIB +H ram -H Remove Hidden C: ATTRIB –H ram +S Apply System C: ATTRIB +S ram -S Remove System C: ATTRIB –S ram