使用 Python 向子 shell 发送命令

Question

我需要在启动后向 shell "MYSHELL>" 发送命令。

prcs = subprocess.Popen("MYSHELL; cmnd1; cmnd2;",shell=True,
subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)

outputPrcs, err =  prcs.communicate()
print outputPrcs

仅输入 shell 时出现问题，其他命令 (cmnd1; cmnd2;) 未发送。

结果：我的壳>

Answer 1

来自docs：

communicate(self, input=None)
   Interact with process: Send data to stdin.  Read data from
   stdout and stderr, until end-of-file is reached.  Wait for
   process to terminate.  The optional input argument should be a
   string to be sent to the child process, or None, if no data
   should be sent to the child.

注意，Wait for process to terminate.我想你需要的是pexpect。它不在标准库中，但它会做你想做的事。

示例：

import pexpect

process = pexpect.spawn("python")
process.expect_exact(">>> ")
process.sendline('print("It works")')
process.expect("\n.*\n")
response = process.after.strip()
print(response)

输出：

It works

Answer 2

如果您想将输入发送到 shell，那么您应该将其作为参数传递给 communicate，如下所示：

prcs = subprocess.Popen("MYSHELL",shell=True,
subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)

outputPrcs, err =  prcs.communicate("cmnd1; cmnd2;")
print outputPrcs

测试：

>>> from subprocess import *
>>> p = Popen("python", shell=True, stdin=PIPE, stdout=PIPE, stderr=PIPE)
>>> o,e = p.communicate("print 'it works'")
>>> print o
it works

>>>

Answer 3

它将起作用@Ahmed。在 linux 上尝试以下代码：

from subprocess import *  
cmd = "MYSHELL\ncmd1\ncmd2\n"
p = Popen('/bin/bash', shell=False, universal_newlines=True, stdin=PIPE, stdout=PIPE, stderr=PIPE)    
o, e = p.communicate(cmd)    

print('Output: ' + o.decode('ascii'))  
print('Error: '  + e.decode('ascii'))  
print('code: ' + str(p.returncode))

使用 Python 向子 shell 发送命令

Using Python to send commands to a subshell

python

shell

subshell