perl

The Perl 5 language interpreter.

=> More information.

• 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 multiline 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 the first capture group for each line:

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

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