How to capture the output of executed command (python paramiko )?

Question

I am executing certain commands and would like to capture the output of the same.

import paramiko ssh = paramiko.SSHClient() ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy()) ssh.connect(ip,username="username",password="pwd") stdin, stdout, stderr = ssh.exec_command("whoami") out = stdout.read() print out # prints username print stdout.read() # prints nothing, why is it so ? # Instance #1 stdin, stdout, stderr = ssh.exec_command("kill -9 1111") out = stdout.read() print out #prints nothing. expected as it doesn't capture if it's successful # print out # should print "-bash: kill: (1111) - No such process" , if it doesn't exist #--> Instance #2

In Instance #1, why print stdout.read() , prints nothing ?

In Instance #2, How to capture such outputs/response ?

pynexj · Accepted Answer · 2017-08-20 15:13:22Z

instance #1

out = stdout.read() print stdout.read()

The first stdout.read() has already consumed all the output so the second stdout.read() returns nothing.

instance #2

Usually error messages would print to stderr so you should use stderr.read() to get the error.

jino dav · Accepted Answer · 2017-11-24 11:11:48Z

It probably prints nothing because stdout is empty because of an error in the execution. Try printing stderr instead of stdout

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How to capture the output of executed command (python paramiko )?

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