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, saving a backup 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}}/'