I would appreciate it if you could tell me about the 'ErrorReturnCode' that is currently occurring.

[온실 속 선인장]

It is normal that there is no current result value.
If the result is present, no Error occurs.
If there is no data value, is it right to occur like 'ErrorReturnCode'?
No message found in STDOUT/STDERR.
I'll leave a simple test code.

I'd appreciate it if you could tell me about the contents.

#!/usr/bin/python
# -*- coding: utf-8 -*-
import sh


def test_sh(application_properties):
    cat = sh.Command("cat")
    grep = sh.Command("grep")
    try:
        result = grep(grep(cat(application_properties), "-v", "#"), "management.endpoints.web.base-path")
    except sh.ErrorReturnCode as e:
        print(e)
        return None
    output = str(result).strip()
    return output.split("=")[-1]


if __name__ == "__main__":
    path = './application.properties'
    print(test_sh(path))

Now let's look at the problematic cases.

$ cat application.properties              
spring.application.name=hello
spring.profiles=default,development
management.endpoint.restart.enabled=true
# management.endpoints.web.base-path=/manage

$ python ex_sh.py


  RAN: /usr/bin/grep management.endpoints.web.base-path

  STDOUT:


  STDERR:

None

Now let's look at the normal case.

$  cat application.properties
spring.application.name=hello
spring.profiles=default,development
management.endpoint.restart.enabled=true
management.endpoints.web.base-path=/manage

$ python ex_sh.py 
/manage

Thank you.

[Erik Cederstrand]

This is just how grep works. See my comment in #629 (comment)

[Erik Cederstrand]

Closing as duplicate of #629