Environment variable differences when using Paramiko
The SSHClient.exec_command
by default does not allocate a pseudo terminal for the session. As a consequence a different set of startup scripts is (might be) sourced (particularly for non-interactive sessions, .bash_profile
is not sourced). And/or different branches in the scripts are taken, based on an absence/presence of TERM
environment variable.
To emulate the default Paramiko behavior with the ssh
, use the -T
switch:
ssh -T myuser@host
See the ssh
man:
-T
Disable pseudo-tty allocation.
Contrary, to emulate the default ssh
behavior with Paramiko, set the get_pty
parameter of the exec_command
to True
:
def exec_command(self, command, bufsize=-1, timeout=None, get_pty=False):
Though rather than working around the issue by allocating the pseudo terminal in Paramiko, you should better fix your startup scripts to set the same PATH
for all sessions.
For that see Some Unix commands fail with "<command> not found", when executed using Python Paramiko exec_command.
Working with the Channel
object instead of the SSHClient
object solved my problem.
chan=ssh.invoke_shell()
chan.send('echo $PATH\n')
print (chan.recv(1024))
For more details, see the documentation