[SOLVED] grep in Debian and OSX different results

Issue

I have a Dockerfile and would like to grep AIRFLOW_VERSION from it:

Dockerfile

ARG AIRFLOW_VERSION="2.1.0" <---- This one

This command works fine on my local machine (OSX):

export AIRFLOW_VERSION=$(grep "ARG AIRFLOW_VERSION=" /Dockerfile | grep -Eo "\d\.\d\.\d")
echo $AIRFLOW_VERSION                                                                                                             
2.1.0

But when I run it on Debian machine (Gitlab Runner), it founds nothing. Pulled the image of the runner locally and double-checked, nothing was found. The file is there, no issue with missing on misplaced file.

Solution

I believe that the issue is related to different version of grep implementation: GNU for Debian and BSD for Mac OS.

Try to replace -E with -P like: grep -Po "\d\.\d\.\d".

Answered By - Exploding Kitten