我试图通过python3.4
执行以下子进程命令cd /home/mailer-domains/domain | rndc loadkeys domain
我尝试了很多使用.call和.Popen的方法,但它不喜欢我的管道,或者它不喜欢我的开关
>>> subprocess.call(['cd /home/mailer-domains/'+domain, '|', 'rndc', 'loadkeys', domain])
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python3.4/subprocess.py", line 537, in call
with Popen(*popenargs, **kwargs) as p:
File "/usr/local/lib/python3.4/subprocess.py", line 859, in __init__
restore_signals, start_new_session)
File "/usr/local/lib/python3.4/subprocess.py", line 1457, in _execute_child
raise child_exception_type(errno_num, err_msg)
FileNotFoundError: [Errno 2] No such file or directory: 'cd /home/mailer-domains/lecomm.com'
>>> subprocess.call(['cd /home/ex-mailer-domains/'+domain, '&&', 'rndc', 'loadkeys', domain])
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python3.4/subprocess.py", line 537, in call
with Popen(*popenargs, **kwargs) as p:
File "/usr/local/lib/python3.4/subprocess.py", line 859, in __init__
restore_signals, start_new_session)
File "/usr/local/lib/python3.4/subprocess.py", line 1457, in _execute_child
raise child_exception_type(errno_num, err_msg)
FileNotFoundError: [Errno 2] No such file or directory: 'cd /home/mailer-domains/lecomm.com'
>>> subprocess.call(['cd', '/home/mailer-domains/'+domain, '&&', 'rndc', 'loadkeys', domain])
cd: too many arguments
2
>>> subprocess.Popen(['cd', '/home/mailer-domains/'+domain, '&&', 'rndc', 'loadkeys', domain])
<subprocess.Popen object at 0x805aa5860>
cd: too many arguments
>>> subprocess.call(['cd', '/home/mailer-domains/'+domain] '&&' ['rndc', 'loadkeys', domain])
File "<stdin>", line 1
subprocess.call(['cd', '/home/mailer-domains/'+domain] '&&' ['rndc', 'loadkeys', domain])
^
SyntaxError: invalid syntax
>>> subprocess.call(['cd', '/home/mailer-domains/'+domain], '&&' ['rndc', 'loadkeys', domain])
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: string indices must be integers
>>> subprocess.call(['cd', '/home/mailer-domains/'+domain], ['rndc', 'loadkeys', domain])
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python3.4/subprocess.py", line 537, in call
with Popen(*popenargs, **kwargs) as p:
File "/usr/local/lib/python3.4/subprocess.py", line 767, in __init__
raise TypeError("bufsize must be an integer")
TypeError: bufsize must be an integer
>>> subprocess.call(['cd', '/home/mailer-domains/'+domain] ['rndc', 'loadkeys', domain])
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: list indices must be integers, not tuple
>>> subprocess.call(['cd', '/home/mailer-domains/'+domain] +['rndc', 'loadkeys', domain])
cd: too many arguments
2
>>> ps = subprocess.Popen((['cd', '/home/mailer-domains/'+domain]), stdout = subprocess.PIPE)
>>> output = subprocess.check_output((['rndc', 'loadkeys', domain]), stdin=ps.stdout)
rndc: 'loadkeys' failed: not found
no matching zone 'lecomm.com' in any view
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python3.4/subprocess.py", line 620, in check_output
raise CalledProcessError(retcode, process.args, output=output)
subprocess.CalledProcessError: Command '['rndc', 'loadkeys', 'lecomm.com']' returned non-zero exit status 1
>>> output = subprocess.check_output((['rndc', 'loadkeys', domain]), stdin=ps.stdout, stdout=PIPE)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'PIPE' is not defined
如何通过Python3 subprocess
正确发送2个管道命令?
答案 0 :(得分:4)
答案可以在subprocess documentation。
中找到 subprocess
模块中的函数通常不会调用shell来解释命令,而是直接使用给定的参数调用它们!使用参数shell=True
(Python文档中的示例)可以覆盖此行为:
output = check_output("dmesg | grep hda", shell=True)
但是,如果命令和参数未修复但取决于用户输入,则不建议这样做。然后,正确的方法是使用两个Popen
调用并手动构建管道(再次从Python文档中获取代码示例):
p1 = Popen(["dmesg"], stdout=PIPE)
p2 = Popen(["grep", "hda"], stdin=p1.stdout, stdout=PIPE)
p1.stdout.close() # Allow p1 to receive a SIGPIPE if p2 exits.
output = p2.communicate()[0]
答案 1 :(得分:3)
您根本不需要管道,只需将cwd
传递给子流程:
subprocess.call(['rndc', 'loadkeys', domain],cwd='/home/mailer-domains/'+domain)
如果您确实想要更改目录而不仅仅是子流程,则应使用os.chdir
。