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* perl: improve matching pattern examples * perl: remove in-place find/replace sans -i'.old' * perl: nix -0 from multiline find/replace example * perl: update wording per code review Co-authored-by: Emily Grace Seville <emilyseville7cf@gmail.com> * perl: update placeholders per code review Co-authored-by: Emily Grace Seville <emilyseville7cf@gmail.com> * perl: update wording per code review Co-authored-by: Emily Grace Seville <emilyseville7cf@gmail.com> * perl: update placeholders per code review Co-authored-by: Emily Grace Seville <emilyseville7cf@gmail.com> * perl: update placeholders per code review Co-authored-by: Emily Grace Seville <emilyseville7cf@gmail.com> * perl: update placeholders per code review Co-authored-by: Emily Grace Seville <emilyseville7cf@gmail.com> * perl: add more -e flag markers, tweak wording Co-authored-by: Emily Grace Seville <emilyseville7cf@gmail.com> * perl: "print out" → "print" Co-authored-by: Emily Grace Seville <emilyseville7cf@gmail.com>
36 lines
1.1 KiB
Markdown
36 lines
1.1 KiB
Markdown
# perl
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> The Perl 5 language interpreter.
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> More information: <https://www.perl.org>.
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- Parse and execute a Perl script:
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`perl {{script.pl}}`
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- Check syntax errors on a Perl script:
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`perl -c {{script.pl}}`
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- Parse and execute a Perl statement:
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`perl -e {{perl_statement}}`
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- Run a Perl script in debug mode, using `perldebug`:
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`perl -d {{script.pl}}`
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- Edit all file lines [i]n-place with a specific replacement [e]xpression and save a file with a new extension:
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`perl -p -i'.{{extension}}' -e 's/{{regular_expression}}/{{replacement}}/g' {{path/to/file}}`
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- Run a multi-line replacement [e]xpression on a file, and save the result in a specific file:
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`perl -p -e 's/{{foo\nbar}}/{{foobar}}/g' {{path/to/input_file}} > {{path/to/output_file}}`
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- Run a regular [e]xpression on stdin, printing matching [l]ines:
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`cat {{path/to/file}} | perl -n -l -e 'print if /{{regular_expression}}/'`
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- Run a regular [e]xpression on stdin, printing only the first capture group for each matching [l]ine:
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`cat {{path/to/file}} | perl -n -l -e 'print $1 if /{{before}}({{regular_expression}}){{after}}/'`
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