From @cpansprout

The subject can be understood in both senses. :-)

Running perl with -e '#!perl -s' results in erratic behaviour. Normally, @​ARGV begins with the first argument that perl itself does not interpret​:

$ perl -le 'print("@​ARGV")' 1
1
$ perl -sle 'print("@​ARGV");' -e 'print "styll here"' -- -foo=bar 1
1
styll here

But -e '#!perl -s' causes the argument to a subsequent -e to be included in @​ARGV magically​:

$ perl -le '#!perl -s' -e 'print("@​ARGV")' 1
print("@​ARGV") 1

Even including switches like -w that perl itself is interpreting​:

$ perl -le '#!perl -s' -e 'print("@​ARGV"); 3' -w a
Useless use of a constant in void context at -e line 2.
Name "main​::e" used only once​: possible typo at -e line 1.
print("@​ARGV"); 3 -w a

Unless the argument to -e is part of the same command-line argument​:

$ perl -le '#!perl -s' -e'print("@​ARGV");' -w
Name "main​::eprint("@​ARGV");" used only once​: possible typo at -e line 1.
Name "main​::w" used only once​: possible typo at -e line 1.

Those ‘used once’ warning suggest that -s is parsing the switches to perl itself. And then perl is parsing them, too.

Let’s see​:

$ perl -le '#!perl -s' -e'$a += 1; print ${"e\$a +"};'
1; print ${"e\$a +"};

I wonder if I could write a quine with this. :-)

Flags​:
  category=core
  severity=low

Site configuration information for perl 5.15.6​:

Configured by sprout at Thu Dec 29 12​:39​:18 PST 2011.

Summary of my perl5 (revision 5 version 15 subversion 6) configuration​:
  Snapshot of​: 7d9189d
  Platform​:
  osname=darwin, osvers=10.5.0, archname=darwin-thread-multi-2level
  uname='darwin pint.local 10.5.0 darwin kernel version 10.5.0​: fri nov 5 23​:20​:39 pdt 2010; root​:xnu-1504.9.17~1release_i386 i386 '
  config_args='-de -Dusedevel -Dmad -Duseithreads'
  hint=recommended, useposix=true, d_sigaction=define
  useithreads=define, usemultiplicity=define
  useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
  use64bitint=undef, use64bitall=undef, uselongdouble=undef
  usemymalloc=n, bincompat5005=undef
  Compiler​:
  cc='cc', ccflags ='-fno-common -DPERL_DARWIN -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include',
  optimize='-O3',
  cppflags='-fno-common -DPERL_DARWIN -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
  ccversion='', gccversion='4.2.1 (Apple Inc. build 5664)', gccosandvers=''
  intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
  d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
  ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
  alignbytes=8, prototype=define
  Linker and Libraries​:
  ld='env MACOSX_DEPLOYMENT_TARGET=10.3 cc', ldflags =' -fstack-protector -L/usr/local/lib'
  libpth=/usr/local/lib /usr/lib
  libs=-ldbm -ldl -lm -lutil -lc
  perllibs=-ldl -lm -lutil -lc
  libc=, so=dylib, useshrplib=false, libperl=libperl.a
  gnulibc_version=''
  Dynamic Linking​:
  dlsrc=dl_dlopen.xs, dlext=bundle, d_dlsymun=undef, ccdlflags=' '
  cccdlflags=' ', lddlflags=' -bundle -undefined dynamic_lookup -L/usr/local/lib -fstack-protector'

Locally applied patches​:
 

@​INC for perl 5.15.6​:
  /usr/local/lib/perl5/site_perl/5.15.6/darwin-thread-multi-2level
  /usr/local/lib/perl5/site_perl/5.15.6
  /usr/local/lib/perl5/5.15.6/darwin-thread-multi-2level
  /usr/local/lib/perl5/5.15.6
  /usr/local/lib/perl5/site_perl
  .

Environment for perl 5.15.6​:
  DYLD_LIBRARY_PATH (unset)
  HOME=/Users/sprout
  LANG=en_US.UTF-8
  LANGUAGE (unset)
  LD_LIBRARY_PATH (unset)
  LOGDIR (unset)
  PATH=/usr/bin​:/bin​:/usr/sbin​:/sbin​:/usr/local/bin​:/usr/X11/bin​:/usr/local/bin
  PERL_BADLANG (unset)
  SHELL=/bin/bash

From @cpansprout

On Sun Jan 01 13​:12​:30 2012, sprout wrote​:

I wonder if I could write a quine with this. :-)

perl -le '#!perl -s' -e'$a=1;print+"perl -le \x27#!perl -s\x27
-e\x27\$a=${q\e$a\}\x27"'

--

Father Chrysostomos

The RT System itself - Status changed from 'new' to 'open'