CODEWITHSUNDEEP
macosdockerdebian
Simon Osipov
Simon Osipov

Reputation: 424

grep in Debian and OSX different results

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.

Upvotes: 0

Views: 76

Answers (2)

SYN
SYN

Reputation: 5041

You're trying to use perl regexpr (PCRE) :

echo AIRFLOW_VERSION="2.1.0" | grep -Po "\d\.\d\.\d"

On debian, the -E implies Extended Regexprs (ERE):

 echo AIRFLOW_VERSION="2.1.0" | grep -oE "[0-9]+\.[0-9]+\.[0-9]+"

Upvotes: 1

Exploding Kitten
Exploding Kitten

Reputation: 1910

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".

Upvotes: 1

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