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python shell½Å±¾(Ö÷Òª½²¹ÜµÀ²Ù×÷µÄÖ§³Ö)

ÕâÀïÌṩµÄÖ»ÊÇÒ»¸öÖ§³Ö¹ÜµÀµÄÃüÁîÖ´ÐнӿÚ, ÖÁÓÚ»ñÈ¡ÃüÁî, À©Õ¹×Ô¼ºµÄÃüÁî, ¾Í²»ÔÙ׸Êö.
¶ÔÓÚϵͳµÄÃüÁî, ¿ÉÒÔÖ±½Óµ÷ÓÃÕâ¸ö½Ó¿Ú·½·¨, ¶à¸öÃüÁîÖ§³Ö¹ÜµÀ²Ù×÷.  ·¢Éú´íÎóʱ, Òý·¢OSError.
1. Åжϴ«ÈëÃüÁîÊÇ·ñÊÇ×Ö·û´®ÀàÐÍ
2. ´«ÈëµÄÿ¸öÃüÁî.
3. ±éÀúËùÓÐÃüÁî.
4. »ñȡÿ¸öÃüÁîµÄÃüÁî¼°²ÎÊý
5. ¶¯Ì¬Ö´ÐÐPopen, ²¢½«·µ»ØÖµ·ÅÈëÁбípopensÖÐ
6. ¶¯Ì¬Ö´Ðй¹½¨µÄPopen, µÚÒ»¸öÖ»ÓÐstdin²»Ê¹ÓùܵÀ, ×îºóÒ»¸östdoutÖ¸¶¨Îªsys.stdout. ÆäÓàµÄ¶¼ÊÇPIPE
7. ±éÀúÈ¡³öPopen¶ÔÏó, ½«Ç°Ò»¸ö¶ÔÏóµÄstdoutдÈëµ½ºóÒ»¸ö¶ÔÏóµÄstdinÖÐ.
'''
Created on 2009-10-21
@author: selfimpr
@blog: http://blog.csdn.net/lgg201
@E-mail: lgg860911@yahoo.com.cn
@function: ²âÊÔ¹ýFreeBSDÏ¿ÉÒÔʹÓÃ. ÊÇÒ»¸öСÁ·Ï°, ×÷ÓÃÊǽ«ÏµÍ³ÃüÁî×÷Ϊ²ÎÊý´«Èë, Ö´ÐÐ. ½ÓÊܵIJÎÊýÖ§³Ö¹ÜµÀ²Ù×÷, ¹ÜµÀ²Ù×÷·ûʹÓÃ|.
'''
from sys import stdout
from subprocess import Popen, PIPE
def pipecmd(cmdstr):
if isinstance(cmdstr, str): # estimate if the argument is string
cmds = cmdstr.split('|') # split intact cmdstr to sigle command
cmds = [cmd.strip() for cmd in cmds] # strip space character
length = len(cmds)
popens = []
for index, cmd in enumerate(cmds): # each all the commands
cmd_args = cmd.split(' ')
cmd_args = [arg.strip() for arg in cmd_args]
try:
#################
# get all the instance of Popen
#################
popens.append(eval('Popen(cmd_args%(stdin)s%(stdout)s)' % \
{'stdin': '' if index == 0 else ', stdin=PIPE', \
'stdout': ', stdout=stdout' if index == length - 1 else ', stdout=PIPE'}))
except OSError, e:
print 'arises os error'
#################
# process pipe
#################
prev = None
for index, popenobj in enumerate(popens):
if not prev:
prev = popenobj
continue
popenobj.stdin.write


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