watch hex output live

stub.py

# monitors a process that is outputting a stream of bytes and prints them live in hex form to stdout. 
# could be made more pretty with ncurses and the like, but this does what it needs to do. 

import sys
import subprocess


subprocess.run(["tput", "smcup"])

proc = subprocess.Popen(sys.argv[1:], bufsize=0, stdout=subprocess.PIPE)

try:
    for c in iter(lambda: proc.stdout.read(1), b""):
        sys.stdout.write("%02X " % c[0])
        sys.stdout.flush()
except KeyboardInterrupt:
    sys.stdout.write("\n")
    sys.stdout.flush()
finally:
    subprocess.run(["tput", "rmcup"])