tldr/pages/common/perl.md

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# 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}}`
- Edit all file lines [i]n-place with a specific replacement [e]xpression and save a file with a new extension:
`perl -p -i'.{{extension}}' -e 's/{{regular_expression}}/{{replacement}}/g' {{path/to/file}}`
- Run a multi-line replacement [e]xpression on a file, and save the result in a specific file:
`perl -p -e 's/{{foo\nbar}}/{{foobar}}/g' {{path/to/input_file}} > {{path/to/output_file}}`
- Run a regular [e]xpression on stdin, printing matching [l]ines:
`cat {{path/to/file}} | perl -n -l -e 'print if /{{regular_expression}}/'`
- Run a regular [e]xpression on stdin, printing only the first capture group for each matching [l]ine:
`cat {{path/to/file}} | perl -n -l -e 'print $1 if /{{before}}({{regular_expression}}){{after}}/'`