Epson 386SX - Manual (Page 110)

Renaming Files
You can use the RENAME command to change the name of
a file or group of files on the same disk and directory. For
example, to rename a file named PROSPECT (in the current
directory) to CLIENT, type the following and press
Enter:
RENAME PROSPECT CLIENT
You can shorten the RENAME command to REN. For example,
to change the name of a file from HAMMERS to WRENCHES,
you can type the following and press Enter:
REN HAMMERS WRENCHES
You can use wildcards to rename groups of files. For example, to
change the extensions of all files on drive C with the extension
.NEW from .NEW to .OLD, type the following and press Enter:
REN C:*.NEW *.OLD
To add the extension .OLD to all files that begin with the same
four characters, MEMO, but end with one varying character,
type the following and press Enter:
REN MEMO? MEMO?.OLD
This command renames files such as MEMO1 and MEMO2 to
MEMO1 .OLD and MEM02.OLD.
See your MS-DOS Reference Manual for more information on
the RENAME command.
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Using MS-DOS with Your Equity 386SX