列出特定文件夹下面小于特定大小的文件

#!/usr/bin/env python
 
"""
FindSmallFile.py
 
SYNOPSIS
 
    Print the file name which size is small
    than the cutoff value in the given path.
 
DESCRIPTION
 
    python FindSmallFile.py -d path_to_file -e cutoff_value
 
OPTIONS

    -e : the cutoff value (eg. 1K, 2.5K, 1M, 2,G ...)

    -d : the path of the file in (eg. /home/quwb/)
 
    -? : display help (--? and --help do the same thing).
 
    -v : verbose output
 
EXAMPLES
 
    python FindSmallFile.py -d ./ -e 1.2k
 
AUTHOR
 
    Wubin Qu
 
LICENSE
 
    This script is under the GPL licenses.
 
"""
 
import sys, os, getopt, traceback
import time
import re
import string
 
VERBOSE = False
 
def exit_with_usage ():
 
    print globals()['__doc__']
    os._exit(1)
 
def parse_args (options='', long_options=[]):
 
    try:
        optlist, args = getopt.getopt(sys.argv[1:], options+'?', long_options+['help','?'])
    except Exception, e:
        print str(e)
        exit_with_usage()
    options = dict(optlist)
    if [elem for elem in options if elem in ['-?','--?','--help']]:
        exit_with_usage()
    return (options, args)
 
def main ():
 
    global VERBOSE
 
    (options, args) = parse_args('vd:e:')
    if '-v' in options:
        VERBOSE = True
    else:
        VERBOSE = False
   
    if options.has_key('-d') and options['-d'] != '':
    path = options['-d']
    else:
    print 'option "-d" is needed'
    exit_with_usage()

    if options.has_key('-e') and options['-e'] != '':
    cutoff = options['-e']
    else:
    print 'option "-e" is needed'
    exit_with_usage()

    cutoff = str(cutoff)
    if cutoff.find('K') >= 0:
    cutoff = re.sub('K', '', cutoff)
    cutoff = string.atoi(cutoff) * 1024
    elif cutoff.find('M') >= 0:
    cutoff = re.sub('M', '', cutoff)
    cutoff = string.atoi(cutoff) * 1024**2
    elif cutoff.find('G') >= 0:
    cutoff = re.sub('G', '', cutoff)
    cutoff = string.atoi(cutoff) * 1024**3
    elif re.search('\D', cutoff):
    print 'cutoff arguments contains some odd characters'
    exit_with_usage()
    else:
    cutoff = string.atoi(cutoff)
   
    for root, dirs, files in os.walk(path):
    for file in files:
        size = os.path.getsize(file)
        if not size:
        print '%s size: 0.' % file
        else:
        if size <= cutoff:
            print '%s size: %d' % (file, size)
   
 
if __name__ == '__main__':
    try:
        start_time = time.time()
        if VERBOSE: print time.asctime()
        main()
        if VERBOSE: print time.asctime()
        if VERBOSE: print 'TOTAL TIME IN MINUTES:',
        if VERBOSE: print (time.time() - start_time) / 60.0
        sys.exit(0)
    except SystemExit, e:
        raise e
    except Exception, e:
        print 'ERROR, UNEXPECTED EXCEPTION'
        print str(e)
        traceback.print_exc()
        os._exit(1)