Question

如何使用pexpect在我登录的远程服务器上运行命令，并将结果以字符串的形式存储到变量中？

我通过以下方式建立了与服务器的连接：

COMMAND_PROMPT = '[#$] '
TERMINAL_PROMPT = '(?i)terminal type\?'
TERMINAL_TYPE = 'vt100'
SSH_NEWKEY = '(?i)are you sure you want to continue connecting'

child = pexpect.spawn('ssh -l %s %s'%(loginuser, servername))
i = child.expect([pexpect.TIMEOUT, SSH_NEWKEY, COMMAND_PROMPT, '(?i)password'])

if i == 0: # Timeout
    print('ERROR! could not login with SSH. Here is what SSH said:')
    print(child.before, child.after)
    print(str(child))
    sys.exit (1)

if i == 1: # In this case SSH does not have the public key cached.
    child.sendline ('yes')
    child.expect ('(?i)password')

if i == 2:
    # If a public key was setup to automatically login
    pass

if i == 3:
    child.sendline(password)
    # Now we are either at the command prompt or
    # the login process is asking for our terminal type.
    i = child.expect ([COMMAND_PROMPT, TERMINAL_PROMPT])
    if i == 1:
        child.sendline (TERMINAL_TYPE)
        child.expect (COMMAND_PROMPT)

现在假设我想在我登录的服务器上执行以下命令，并将结果保存到我的python脚本本身的字符串中：

 ps -ef|grep process1

如何做到这一点？

Answer 1

我认为这可能会对你有帮助。

import subprocess
import sys

url="http://www.anyurlulike.any"
# Ports are handled in ~/.ssh/config since we use OpenSSH
COMMAND="uname -a"
ssh = subprocess.Popen(["ssh", "%s" % url, COMMAND],
                   shell=False,
                   stdout=subprocess.PIPE,
                   stderr=subprocess.PIPE)

result = ssh.stdout.readlines()
if result == []:
error = ssh.stderr.readlines()
print >>sys.stderr, "ERROR: %s" % error
else:
print result

Answer 2

您可以使用read()功能，它会为您提供整个输出。

result = child.read()

在远程服务器上运行命令并将结果保存到Python脚本中的字符串变量

2 个答案: