CODEWITHSUNDEEP
perlgrepglob
Hariprasad C R
Hariprasad C R

Reputation: 67

How can I grep files of specific name patterns?

I have a piece of code in Perl to grep for files with specific names under a directory.

push @{ $output{archives} }, grep {-f $_} "$output{dir}/result0.txt”, "$output{dir}/outcome.txt”;
say "@{ $output{archives} } \n";

This will search for files of names result0.txt, outcome.txt under the directory $output{dir}. These results will be pushed into the array $output{archives}.

How can I search for file names of pattern outcome_0.txt, outcome_1.txt, outcome_2.txt, etc. and push to the array?

I tried changing "$output{dir}/outcome.txt” to "$output{dir}/outcome*.txt”, but it is not giving any results at all.

Upvotes: 0

Views: 163

Answers (1)

Håkon Hægland
Håkon Hægland

Reputation: 40748

If you want find files matching outcome_*.txt you can use the glob function or aka <>: 

push @{ $output{archives} }, grep {-f $_} <"$output{dir}/outcome_*.txt">;

or, using glob instead of <>:

push @{ $output{archives} }, grep {-f $_} glob "$output{dir}/outcome_*.txt";

or using a more specific regexp:

push @{ $output{archives} }, grep {(-f $_) && /outcome_\d+\.txt$/}  glob "$output{dir}/*";

From perldoc glob :

glob
In list context, returns a (possibly empty) list of filename expansions on the value of EXPR such as the standard Unix shell /bin/csh would do. In scalar context, glob iterates through such filename expansions, returning undef when the list is exhausted.

See perldoc glob and perldoc perlop for more information.

Upvotes: 2

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