Redirect python script output to grep

Question

There is a python script that builds cocos2dx-project . When it runs it prints out all the warning and error messages. But I want to get only those lines that contain "error". Therefore, I do the following:

python ./build_native.py | grep "error"

But it still prints everything, not only "error" lines.

EDIT:

In case you need the content of the script file, you can see it here .

Answer 1

You need to redirect stderr to stdout . Only then will grep filter out all lines not containing "error"

python ./build_native.py 2>&1 | grep "error" 

Answer 2

如果您只想传递错误，则可能需要尝试以下方法：

python ./build_native.py 2>&1 >/dev/null | grep "error"