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ATTR.DOC
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1991-04-30
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ATTR (Attribute) Charles Petzold
Purpose: ATTR.COM permits display and modification of the archive, system,
hidden, and read-only file attributes.
Format: ATTR
or
ATTR *.*
or
ATTR [+A|-A] [+S|-S] [+H|-H] [+R|-R]
[d:][path]filename[.ext]
Remarks: Entering ATTR without any parameters, as in the first format shown
above, produces a help display (essentially identical to the third
form above) that shows which file attributes can be changed.
ATTR.COM permits the use of the global ? and * characters (as in the
second format above). Entering ATTR filename displays a specific
file's attributes. For example,
ATTR IBMBIO.COM
returns the display
IBMBIO.COM Arc Sys Hid R-O
showing that the Archive, System, Hidden, and Read-Only bits of the
attribute byte are set for this file.
When wildcards are used to list the attributes of all the files in a
directory, subdirectory names are shown as Dir (between the Arc and
Sys in the example above). Unlike the DOS DIR command, ATTR lists
hidden files, whether sought by specified filename or through a *.*
listing. However, ATTR does not show Volume names or the dot and
double dot entries in subdirectories.
The syntax for changing file attributes is indicated in the third
format above. After typing ATTR (and a space) you simply precede the
file specification with a plus or minus sign, followed by the letter
A (Archive), S (System), H (Hidden), or R (Read-Only). A plus sign
turns on the specified attribute; a minus sign turns it off. More
than one attribute can be changed at once, and the attribute
designating letters may be entered in any order and in upper or
lowercase. No space may be used between the plus or minus and the
letter that follows it, however.
Example: To convert the file 85TAX.WKS to hidden and read-only, you
would enter
ATTR +H +R 85TAX.WKS
Since DOS itself normally sets the Archive bit, entering
ATTR 85TAX.WKS
would produce the display
85TAX.WKS Arc Hid R-O
Since the Hidden attribute has been set, however, the DIR command
will produce the message, "File not found." And since the Read-Only
flag has also been set, a DEL command will produce the message,
"Access denied."