awk,makefile,make,docker , How to put this command in a Makefile?


How to put this command in a Makefile?

Question:

Tag: awk,makefile,make,docker

I have the following command I want to execute in a Makefile but I'm not sure how. The command is docker rmi -f $(docker images | grep "<none>" | awk "{print \$3}")

The command executed between $(..) should produce output which is fed to docker rmi but this is not working from within the Makefile I think that's because the $ is used specially in the Makefile but I'm not sure how to modify the command to fit in there.

Any ideas?


Answer:

$ in Makefiles needs to be doubled to prevent substitution by make:

docker rmi -f $$(docker images | grep "<none>" | awk "{print \$$3}")

Also, it'd be simpler to use use a singly-quoted string in the awk command to prevent expansion of $3 by the shell:

docker rmi -f $$(docker images | grep "<none>" | awk '{print $$3}')

I really recommend the latter. It's usually better to have awk code in single quotes because it tends to contain a lot of $s, and all the backslashes hurt readability.


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