linux - Executing a command thru ssh using pseudo terminal: do not close connection if command is not found

Question

I want to write a small script to automate some commands in python for unix and linux, thru pexpect.

Ex:

ssh -t [email protected] "uname -r && some_cmd_that_exist_or_not && exec /bin/sh"

The problem, is that I don't know from the beginning what type of the OS the machine has, and in some cases the commands are not available.

In this case the connection is closed and a "command not found is returned". I want to continue executing even if a command is not found.

After that I retrive the output using pyexpect. My issue is that I couldn't find an option to keep the connection open if a commad is not found.

Answer 1

Just replace the && with ;:

ssh -t [email protected] 'uname -r; some_cmd_that_may_not_exist; exec /bin/sh'

The && is a short-circuiting operator, so it will stop executing commands as soon as any of the commands fail. If you want to run them all, just don't use it.