使用非默认 shell 和 Python Paramiko 在远程服务器上执行本地脚本

Question

I am trying to run my local bash script on remote server without copying it into remote server. It is as simple as following for test purpose. There are more than a few servers where it runs perfectly, but in some server running tcsh , there is an issue. How do I invoke bash , if following does not work. Below is dummy test.sh

#!/bin/bash
a=test
echo $a
echo $SHELL

I am using Python Paramiko exec_command for remote execution as following:

my_script = open("test.sh").read()
stdin, stdout, stderr = ssh.exec_command(my_script, timeout=15)
print(stdout.read().decode())
err = stderr.read().decode()
if err:
    print(err)

Given, that connection works and same script works for other servers with bash default shell.

This is the output that i get:

/bin/tcsh

printing from errors
a=test: Command not found.
a: Undefined variable.

Answer 1

The #!/bin/bash is a comment. Sending it to a remote shell as a command has no effect.

You have to execute /bin/bash on the server and send your script to it:

stdin, stdout, stderr = ssh.exec_command("/bin/bash", timeout=15)
stdin.write(my_script)

Also, you have to exit the shell at the end of your script, otherwise it will never end.

Related question:
Pass arguments to a bash script stored locally and needs to be executed on a remote machine using Python Paramiko