Hex to Octal (3 digit) converer

With python 2.7 installed, the following program, which I call hex2oct.py, will do it: #!/usr/bin/python2 # Copyright 2015 Eric Smith <spacewar at gmail.com> # Released under Creative Commons BY-SA 4.0 International Public License # https://creativecommons.org/licenses/by-sa/4.0/legalcode import fileinput,re,sys r = re.compile('[0-9A-F]+', re.I) for line in fileinput.input(): while len(line): m = r.search(line) if m: sys.stdout.write(line[:m.start()]) sys.stdout.write("%03o" % int(m.group(),16)) line = line[m.end():] else: sys.stdout.write(line) line = '' Just put that in a file and chmod it to be executable. Change the path in the first line to the location of your python executable. (Alternatively, put "python" or the full path to the python executable on the command line before then name of this program.) By default It takes data from standard input, or you can specify one or more filenames on the command line to be processed sequentially. end-of-file (control-D on Unix and derivatives, control-Z on Windows, though I haven't tested it on Windows). Exit by an empty line with an end-of-file. Any non-hexadecimal data before, between, or after hexadecimal numbers is preserved, so you can have commas, tabs, etc. in the input and get them back in the output. Hexadecimal values larger than FF will likely yield undesired results. The program could be easily modified to ignore them, complain about them, or automatically split up sequences of more than 2 hex digits.