[英]Using && in subprocess.Popen for command chaining?
我使用subprocess.Popen
與Python
,我還沒有碰到過加盟命令(即foobar的一個優雅的解決&&
通過bizbang) Popen
。
我能做到這一點:
p1 = subprocess.Popen(["mmls", "WinXP.E01"], stdout=subprocess.PIPE)
result = p1.communicate()[0].split("\n")
for line in result:
script_log.write(line)
script_log.write("\n")
p1 = subprocess.Popen(["stat", "WinXP.E01"], stdout=subprocess.PIPE)
result = p1.communicate()[0].split("\n")
for line in result:
script_log.write(line)
但這真的不是很美觀(特別是如果我通過Popen
菊花鏈接多個命令。
我想在盡可能少的命令塊中復制此輸出。
not@work ~/ESI/lab3/images $ mmls WinXP.E01 && echo -e "\n" && stat WinXP.E01
DOS Partition Table
Offset Sector: 0
Units are in 512-byte sectors
Slot Start End Length Description
00: Meta 0000000000 0000000000 0000000001 Primary Table (#0)
01: ----- 0000000000 0000000062 0000000063 Unallocated
02: 00:00 0000000063 0020948759 0020948697 NTFS (0x07)
03: ----- 0020948760 0020971519 0000022760 Unallocated
File: `WinXP.E01'
Size: 4665518381 Blocks: 9112368 IO Block: 4096 regular file
Device: 14h/20d Inode: 4195953 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 1000/ nott) Gid: ( 1000/ nott)
Access: 2013-03-16 23:20:41.901326579 -0400
Modify: 2013-03-04 10:05:50.000000000 -0500
Change: 2013-03-13 00:25:33.254684050 -0400
Birth: -
注意:我想避免在subprocess.Popen
鍵入它
p1 = subprocess.Popen(["mmls WinXP.E01 && echo -e '\n' && stat WinXP.E01"], stdout=subprocess.PIPE)
&&是一個shell操作符,POpen默認不使用shell。
如果你想使用shell功能在你的POpen調用中使用shell = True,但要注意它稍慢/內存密集。
p1 = subprocess.Popen(["mmls", "WinXP.E01", "&&", "echo", "-e", "\"\n\"", "&&", "stat", "WinXP.E01"],
stdout=subprocess.PIPE, shell=True)
這個怎么樣:
from subprocess import Popen, PIPE
def log_command_outputs(commands):
processes = [Popen(cmd, stdout=PIPE) for cmd in commands]
outputs = [proc.communicate()[0].split() for proc in processes]
for output in outputs:
for line in output:
script_log.write(line)
script_long.write("\n")
這會並行啟動命令,這可能會比逐個執行命令(但可能不是很大)。 由於communicate
調用是順序的,因此任何具有大輸出(超過管道緩沖區)的命令都將阻塞,直到它被清理為止。
對於您的示例命令鏈,您將調用:
log_command_outputs([["mmls", "WinXP.E01"], ["stat", "WinXP.E01"]])
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