tldr/pages/common/perl.md

# perl

> The Perl 5 language interpreter.
> More information: <https://www.perl.org>.

- Parse and execute a Perl script:

`perl {{script.pl}}`

- Check syntax errors on a Perl script:

`perl -c {{script.pl}}`

- Parse and execute a perl statement:

`perl -e {{perl_statement}}`

- Run a Perl script in debug mode, using `perldebug`:

`perl -d {{script.pl}}`

- Loo[p] over all lines of a file, editing them [i]n-place using a find/replace [e]xpression:

`perl -p -i -e 's/{{find}}/{{replace}}/g' {{filename}}`

- Run a find/replace expression on a file, saving the original file with a given extension:

`perl -p -i'.old' -e 's/{{find}}/{{replace}}/g' {{filename}}`

- Run a multi-line find/replace expression on a file, and save the result in another file:

`perl -p0e 's/{{foo\nbar}}/{{foobar}}/g' {{input_file}} > {{output_file}}`

- Run a regular expression on `stdin`, printing out first capture group for each line:

`cat {{path/to/input_file}} | perl -nle 'if (/.*({{foo}}).*/) {print "$1"; last;}'`