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Postings from April 2011
The perlrun manpage says a few minor things that `perl -h` does not,
which come from perl.c/S_usage().
% blead -h
Usage: perl [switches] [--] [programfile] [arguments]
-0[octal] specify record separator (\0, if no argument)
Not quite; perlrun now has -0[octal/hexadecimal] there.
-a autosplit mode with -n or -p (splits $_ into @F)
-C[number/list] enables the listed Unicode features
-c check syntax only (runs BEGIN and CHECK blocks)
Not quite; perlrun now says it runs BEGIN, UNITCHECK, and CHECK blocks, and also use statements.
-d[:debugger] run program under debugger
Not quite; perlrun says you can also use -dt[:debugger] to run
threaded program under debugger
-D[number/list] set debugging flags (argument is a bit mask or alphabets)
I wonder why we don't accept hex flags here from Perl_get_debug_opts().
That would make specifying the numbers way easier. I kinda wonder why
we even *can* specify numbers, they're so clunky.
-e program one line of program (several -e's allowed, omit programfile)
-E program like -e, but enables all optional features
-f don't do $sitelib/sitecustomize.pl at startup
-F/pattern/ split() pattern for -a switch (//'s are optional)
-i[extension] edit <> files in place (makes backup if extension supplied)
-Idirectory specify @INC/#include directory (several -I's allowed)
-l[octal] enable line ending processing, specifies line terminator
-[mM][-]module execute "use/no module..." before executing program
-n assume "while (<>) { ... }" loop around program
-p assume loop like -n but print line also, like sed
-s enable rudimentary parsing for switches after programfile
-S look for programfile using PATH environment variable
-t enable tainting warnings
-T enable tainting checks
-u dump core after parsing program
Should -u be marked obsolete, or removed from the summary?
-U allow unsafe operations
-v print version, patchlevel and license
-V[:variable] print configuration summary (or a single Config.pm variable)
-w enable many useful warnings
-W enable all warnings
-x[directory] ignore text before #!perl line (optionally cd to directory)
-X disable all warnings
--tom
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