Aaron Couch Aaron Couch - 1 month ago 36
Python Question

Paramiko capturing command output

I have an issue that has been giving me a headache for a few days. I am using the Paramiko module with Python 2.7.10 and I'd like to issue multiple commands to a Brocade router, but only return output from one of the given commands like so:

#!/usr/bin/env python
import paramiko, time

router = 'r1.test.example.com'
password = 'password'
username = 'testuser'

ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(router, username=username, password=password)
print('Successfully connected to %s' % router)

remote_conn = ssh.invoke_shell()
output = remote_conn.recv(1000)

# Disable paging on Brocade.
remote_conn.send('terminal length 0\n')
# Check interface status.
remote_conn.send('show interfaces ethernet 0/1\n') # I only want output from this command.
time.sleep(2)
output = remote_conn.recv(5000)
print(output)


If I were to print the full output it would contain everything issued to the router, but I only want to see output from the show
interfaces ethernet 0/1\n
command.

Can anyone help with this issue?

One final thing I would like to ask. I want to filter through the
output
variable and check for occurrences of strings like "up" or "down", but I can't seem to get it to work because everything in the output appears to be on new lines?

For example:

If I iterate over the
output
variable in a for loop I get all of the characters in the variable like so:

for line in output:
print(line)


I get an output like this:

t

e

r

m

i

n

a

l

l

e

n

g

t

h

0

Any way around this?

Again,

Thanks in advance for any help.

Best regards,

Aaron C.

Answer

For your second question: Though I am not specialist of paramiko, I see that function recv, according to the doc, returns a string. If you apply a for loop on a string, you will get characters (and not lines as one might perhaps expect). The newline is caused by your use of the print function as explained on this page, at paragraph 6.3.

I haven't studied what paramiko suggests to do. But why don't you treat the full string as a single entity? For example, you could check the presence of "up" as:

if "up" in output:

Or, if that suits your needs better, you could split the string into lines and then do whatever test you want to do:

for line in output.split('\n'): 
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