redbo's rfind

rfind.py

#!/usr/bin/python
"""
python rfind.py [search term] [filename]
"""

import mmap
import os
import sys

_cmd, search_term, filename = sys.argv

with open(filename, 'r+') as fp:
    mmapped = mmap.mmap(fp.fileno(), os.path.getsize(filename))
    position = mmapped.rfind(search_term)
    if position == -1:
        sys.exit(1)
    else:
        line_start = mmapped.rfind('\n', 0, position)
        if line_start == -1:
            line_start = 0
        else:
            line_start += 1
        line_end = mmapped.find('\n', position)
        if line_end == -1:
            line_end = os.path.getsize(filename)
        fp.seek(line_start)
        print fp.read(line_end - line_start)