tail -f multiple files

multitail

# tail multiple files
# based on http://www.dabeaz.com/coroutines/follow.py
import sys
import time
import itertools


def tail(filenames):

    # open files
    files = {f: open(f, 'rt') for f in filenames}
    for f in files.values():
        f.seek(0, 2)

    for name, buf in itertools.cycle(files.items()):
        while True:
            line = buf.readline()
            if not line:
                break
            yield name, line
        time.sleep(0.1)

if __name__ == '__main__':
    try:
        for filename, line in tail(sys.argv[1:]):
            print '[%s] %s' % (filename, line),
    except KeyboardInterrupt:
        pass