Cơ chế của lệnh dir trong dos

các bạn cho mình hỏi cơ chế của lệnh dir trong dos?

C:\Users\TOM>dir /?

Displays a list of files and subdirectories in a directory.



DIR [drive:][path][filename] [/A[[:]attributes]] [/B] [/C] [/D] [/L] [/N]

[/O[[:]sortorder]] [/P] [/Q] [/R] [/S] [/T[[:]timefield]] [/W] [/X] [/4]



[drive:][path][filename]

Specifies drive, directory, and/or files to list.



/A Displays files with specified attributes.

attributes D Directories R Read-only files

H Hidden files A Files ready for archiving

S System files I Not content indexed files

L Reparse Points - Prefix meaning not

/B Uses bare format (no heading information or summary).

/C Display the thousand separator in file sizes. This is the

default. Use /-C to disable display of separator.

/D Same as wide but files are list sorted by column.

/L Uses lowercase.

/N New long list format where filenames are on the far right.

/O List by files in sorted order.

sortorder N By name (alphabetic) S By size (smallest first)

E By extension (alphabetic) D By date/time (oldest first)

G Group directories first - Prefix to reverse order

/P Pauses after each screenful of information.

/Q Display the owner of the file.

/R Display alternate data streams of the file.

/S Displays files in specified directory and all subdirectories.

/T Controls which time field displayed or used for sorting

timefield C Creation

A Last Access

W Last Written

/W Uses wide list format.

/X This displays the short names generated for non-8dot3 file

names. The format is that of /N with the short name inserted

before the long name. If no short name is present, blanks are

displayed in its place.

/4 Displays four-digit years



Switches may be preset in the DIRCMD environment variable. Override

preset switches by prefixing any switch with - (hyphen)--for example, /-W.