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}}`
- 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;}'`