BASIC-DOS

HEXDUMP

HEXDUMP file [/S offset] [/N length]

Displays the bytes of file, 16 per line, in the same format as DEBUG’s DB command: an address, the bytes in hexadecimal (with a dash after the 8th), and the same bytes as characters (with a period for each byte outside 20h-7Eh). The address is the file offset, written as a segment and an offset, where the segment is 1000h for each 64K (eg, offset 65536 is 1000:0000).

• /S starts at a decimal offset (by default, 0)
• /N displays at most length bytes (by default, the rest of the file)

As with DB, lines begin at multiples of 16, so the first and last lines can be partial.

HEXDUMP NAMES.TXT /N 24
0000:0000 4F 6E 65 0D 0A 54 77 6F-0D 0A 54 77 6F 0D 0A 74  One..Two..Two..t
0000:0010 68 72 65 65 0D 0A 46 6F-                         hree..Fo
HEXDUMP NAMES.TXT /S 5 /N 3
0000:0000                54 77 6F-                              Two

If file doesn’t exist, HEXDUMP displays Unable to find and its name, or if its drive doesn’t exist, Invalid drive. A missing file name, a second file name, an unknown switch, or a negative offset displays Syntax error, and a negative length is the same as no /N.

Source: HEXDUMP.BAS

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