这里使用了 python 的基本代码实现了 linux 系统下 wc 命令程序的基本功能。
#!/usr/bin/env python
#encoding: utf-8
# author: liwei
# function: wc program by python
from optparse import optionparser
import sys,os
def opt():
parser = optionparser()
parser.add_option(‘-c’, ‘–char’,
dest=’chars’,
action=’store_true’,
default=false,
help=’only count chars’)
parser.add_option(‘-w’, ‘–word’,
dest=’words’,
action=’store_true’,
default=false,
help=’only count words’)
parser.add_option(‘-l’, ‘–line’,
dest=’lines’,
action=’store_true’,
default=false,
help=’only count lines’)
parser.add_option(‘-n’, ‘–nototal’,
dest=’nototal’,
action=’store_true’,
default=false,
help=’don\’t print total information’)
options, args = parser.parse_args()
return options, args
#print options
def get_count(data):
chars = len(data)
words = len(data.split())
lines = data.count(‘\n’)
return lines, words, chars
#if not options.chars and not options.words and not options
def print_wc(options, lines, words, chars, fn):
if options.lines:
print lines,
if options.words:
print words,
if options.chars:
print chars,
print fn
def main():
options, args = opt()
if not (options.lines or options.words or options.chars):
options.lines, options.words, options.chars = true, true, true
if args:
total_lines, total_words, total_chars = 0, 0, 0
for fn in args:
if os.path.isfile(fn):
with open(fn) as fd:
data = fd.read()
lines, words, chars = get_count(data)
print_wc(options, lines, words, chars, fn)
total_lines += lines
total_words += words
total_chars += chars
elif os.path.isdir(fn):
print >> sys.stderr, ‘%s is a directory’ %fn
else:
sys.stderr.write(‘%s: no such file or directory\n’ % fn)
# 只有多个文件的时候会计算出total字段
if len(args) > 1 and not options.nototal:
print_wc(options, total_lines, total_words, total_chars, ‘total’)
else:
fn = ”
data = sys.stdin.read()
lines, words, chars = get_count(data)
print_wc(options, lines, words, chars, fn)
if __name__ == ‘__main__’:
main()
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