"
 ./father.pl
this is father, $0=./father.pl $^X=/home/sergei/PERL-5.10.0/bin/perl at ./father.pl line 7.
father.pl: @INC=
/home/sergei/PERL-5.10.0/lib/perl5/5.10.0/i686-linux-thread-multi
/home/sergei/PERL-5.10.0/lib/perl5/5.10.0
/home/sergei/PERL-5.10.0/lib/perl5/site_perl/5.10.0/i686-linux-thread-multi
/home/sergei/PERL-5.10.0/lib/perl5/site_perl/5.10.0
. at ./father.pl line 8.
cwd: /home/sergei/junk/perl_package
PATH: /opt/kde3/bin:/home/sergei/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/X11R6/bin:/usr/games:/usr/lib/jvm/jre/bin:/usr/lib/mit/bin:/usr/lib/mit/sbin
$PATH[0]=/opt/kde3/bin at ./father.pl line 14.
father.pl: $^X=/home/sergei/PERL-5.10.0/bin/perl at ./father.pl line 16.
father.pl: about to check Perl ($^X) at ./father.pl line 19.
$cmd=/home/sergei/PERL-5.10.0/bin/perl -h at ./father.pl line 21.

Usage: /home/sergei/PERL-5.10.0/bin/perl [switches] [--] [programfile] [arguments]
  -0[octal]         specify record separator (\0, if no argument)
  -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)
  -d[:debugger]     run program under debugger
  -D[number/list]   set debugging flags (argument is a bit mask or alphabets)
  -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
  -P                run program through C preprocessor before compilation
  -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
  -U                allow unsafe operations
  -v                print version, subversion (includes VERY IMPORTANT perl info)
  -V[:variable]     print configuration summary (or a single Config.pm variable)
  -w                enable many useful warnings (RECOMMENDED)
  -W                enable all warnings
  -x[directory]     strip off text before #!perl line and perhaps cd to directory
  -X                disable all warnings

father.pl: $?=0 at ./father.pl line 23.
".