[英]Using Python to send commands to a subshell
启动后,我需要向外壳程序“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
问题只实现了进入 shell,其他命令 (cmnd1; cmnd2;) 不发送。
结果:MYSHELL>
从文档:
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.
我认为你需要的是pexpect 。 它不在标准库中,但它会做你想做的事。
例子:
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
如果您想将输入发送到您的 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
>>>
它会起作用@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))
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