114
MS-DOS User's Guide
Avoiding invalid
filenames
The
MS-DOS directory
Warning Some applications may
not
let you use all
of
these
symbols.
If
in
doubt
use only letters and numbers.
Invalid Filenames
Although you
do
have
some
freedom
when
naming
your
files,
there
are
certain names that you may
not
use,
because
MS·
DOS
reserves
them
for specific devices that
your
computer
uses.
These
invalid names are:
aux,
clockS, com, con, keybdS, Ipt,
1st,
nul,
pm,
and
semS. You may use these names as extensions,
but
remember
not
to
use them
to
name
your
files.
Directories
The
names
of
your
files are
kept
in a
directory
on
each
disk.
The
directory
also contains information
on
the
sizes
of
the
files,
and
the
dates
they
were
created
and updated.
If you
want
to
know
what
files
are
on
your
disk,
you
can
use
the
dir
command. This
command
tells MS·
DOS
to
display all
the
files in
a specific
directory
on
a disk. For example,
if
your
MS-DOS disk is
in drive A and you use
the
dir
command,
the
directory
display
would
look similar
to
this:
Volume
in
drive
A
is
DOS
3-2
Directory
of
A:\
COMMAND
COM
23612
3-21-86
12:00p
ANSI
SYS
1651
3-21-86
12:00p
ATTRIB
EXE
8234
3-21-86
12:00p
BACKUP
EXE
22906
3-21-86
12:00p
CHKDSK
EXE
9680
3-21-86
12:00p
FC
EXE
14446
3-21-86
12:00p
DISKCoPY
EXE
3936
3-21-86
12:00p
DRIVER
SYS
11
02
3-21-86
12:00p
EDLIN
EXE
7356
3-21-86
12:00p
FDISK
EXE
16444
3-21-86
12:00p
FIND
EXE
6403
3-21-86
12:00p
GRAFTABL
EXE
8210
3-21-86
12:00p
GRAPHICS
EXE
13170
3-21-86
12:00p
JOIN
EXE
8942
3-21-86
12:00p
KEYBDV
EXE
2850
3-21-86
12:00p
KEYBFR
EXE
2912
3-21-86
12:00p
KEYBGR
EXE
2904
3-21-86
12:00p
KEVBlT
EXE
2856
3-21-86
12:00p
KEYBSP
EXE
2947
3-21-86
12:00p
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