ssh connection handle pexpect in python

Question

I was trying to automate a system where we have a linux box but customized.. to go to shell we have to pass some input. like below:

tanuj$ ssh [email protected]
Used by Tanuj

Password: 

command line interface

app > en
app # config t
app (config) #

I have written a script using pexpect in python. I am able to login and execute the command

pexpect.sendline("ls -lrt")
pexpect.expect("#")

but when i am using pexpect.before() .. is getting nothing .. when the command output is long and also i could see the pexpect.before has also got the command in it.

any idea how to solve this.. or is there any other python module which i can use to automation a ssh session like i have here.

i also tried using paramiko but it did not work because we have a to execute some commands before we can reach to normal shell prompt.

Could there be a # in the output somewhere before the next prompt? — Thomas K
– Thomas K, Commented Feb 14, 2014 at 18:52

Community · Accepted Answer · 2020-06-20 09:12:55Z

1

I am also facing the similar problem. I was about to ask the question. You are using a # sign in your

pexpect.expect('#')

This # sign comments everything written after it. Further I guess you should create a child process to spawn a process, Like(I don't know if I'm right in your situation):

child=pexpect.spawn('ssh [email protected]')
child.expect('prompt_expected_by_you')     # put in the prompt you expect after sending SSH
child.sendline('your_password')
child.expect('Prompt_expected_by_you')
child.sendline('ls -ltr')
child.expect('Prompt_expected_by_you')
print child.before,            # , will keep continue your newline print
print child.after
child.sendline('exit')
child.expect('Prompt_expected_by_you')
child.sendline('exit')
child.expect('Prompt_expected_by_you')   # may not be required
child.close                              # close the child session

I have successfully used these commands in FTP, but not able to print result of 'LS -LTR' in SSH. I guess i'll have to initiate a shell, but not sure. Any progress on your side?

Could someone help???

edited Jun 20, 2020 at 9:12

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answered Feb 17, 2014 at 8:42

user2593869

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1 Comment

Thomas K Over a year ago

# doesn't start a comment if it appears in a string.

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