I notice that my netmiko code can't run sh run | i host which is a legitimate Cisco command.

When I replace sh run with other command such as sh clo, or show ip interface brief, it works perfectly.

from netmiko import ConnectHandlerR1 = {'device_type': 'cisco_ios','ip': 'Router1','username': 'u','password': 'p'
}R2 = {'device_type': 'cisco_ios','ip': 'Router2','username': 'u','password': 'p'
}all_devices = [R1, R2]for device in all_devices:connect = ConnectHandler(**device)output = connect.send_command('sh run | i host')print(output)

Output

user@linux:~$ python3 script.py 
^
% Invalid input detected at '^' marker.^
% Invalid input detected at '^' marker.user@linux:~$ 

Desired Output

hostname Router1
hostname Router2

Any idea why this code behave this way?

sh run is short for show running-config; this is a privileged-mode command (requires enable first) and you're trying to issue it in unprivileged mode.