ssh not recognized as a command when executed from python using subprocess?

Question

This is my code -

import subprocess
import sys

HOST="xyz3511.uhc.com"
# Ports are handled in ~/.ssh/config since we use OpenSSH
COMMAND="uptime"

ssh = subprocess.Popen(["ssh", "%s" % HOST, COMMAND],
                       shell=True,
                       stdout=subprocess.PIPE,
                       stderr=subprocess.PIPE)
result = ssh.stdout.readlines()
if result == []:
    error = ssh.stderr.readlines()
    print (sys.stderr, "ERROR: %s" % error)
else:
    print (result)

and this is the error I'm getting-

ERROR: [b"'ssh' is not recognized as an internal or external command,\r\n", b'operable program or batch file.\r\n'].

Not sure what I'm doing wrong over here. Also, I haven't mentioned any port. All I want is to use subprocess and connect to remote server, execute a simple command like ls. Python version is 3.x.

are you able to ssh explicitely on terminal? I mean not in Python program — Mufeed
– Mufeed, Commented Jul 3, 2018 at 14:26
Are you executing this on a Windows machine which doesn't have an SSH client (with the name ssh) installed? — Alfe
– Alfe, Commented Jul 3, 2018 at 14:35
@alfe I'm getting the same error on a windows machine with SSH installed (ssh command works in cmd but not in subprocess) — Kennet Celeste
– Kennet Celeste, Commented Aug 6, 2019 at 14:26
Make sure the ssh command is found. Either set you weir Windows equivalent of the PATH variable accordingly or just use the complete path to the ssh executable instead of just ssh, i. e. something like C:\some\path\to\ssh. — Alfe
– Alfe, Commented Aug 8, 2019 at 15:12

Kons · Accepted Answer · 2019-08-27 12:54:57Z

2

Apparently this happens in python3. Workaround found at this link: https://gist.github.com/bortzmeyer/1284249

system32 = os.path.join(os.environ['SystemRoot'], 'SysNative' if platform.architecture()[0] == '32bit' else 'System32')
ssh_path = os.path.join(system32, 'OpenSSH/ssh.exe')
out1, err1 = Popen([ssh_path, "pi@%s"%self.host, "%s"%cmd],
              shell=False,
              stdout=PIPE, 
              stderr=PIPE).communicate()

answered Aug 27, 2019 at 12:54

Kons

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