CODEWITHSUNDEEP
perlmakefile
crazy_prog
crazy_prog

Reputation: 1099

How to write perl one liner in Make?

I am writing the following command to extract the text in makefile:-

@awk '/Exported Layer/,/Total Polygons/' out_compare.err | perl -lane '$el=$F[3] if(/Exported Layer/); print "$el: $f[3]" if (/Total Polygons/);' | cat

But it is giving the following error:-

Can't modify constant item in scalar assignment at -e line 1, near "] if" Execution of -e aborted due to compilation errors.

Would you guys like to suggest something? :-)

Upvotes: 2

Views: 573

Answers (1)

John Marshall
John Marshall

Reputation: 7005

Make is oblivious to shell quoting in commands, so the $ characters in your Perl snippet are being interpreted as make variables $e and $F. These variables don't exist in your makefile and are being expanded as empty, leading to the Perl syntax errors you're seeing.

You need to escape the $ characters from make like this:

... perl -lane '$$el=$$F[3] if(/Exported Layer/); ...

See also the GNU Make manual.

Upvotes: 5

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