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Handling command line options - getopt
Topicalization and Special Variables example from a Well House Consultants training course
More on Topicalization and Special Variables [link]
Source code: gop2 Module: P210
=head1 Handling command line options with getopts The getopts sub (in the Getopt::std module that's supplied with the Perl distribution) lets you process command line parameters (from @ARGV) ... filtering out options into flag variables without the need for you to write (and maintain) that code yourself. =cut use Getopt::Std; print "Raw parameters: @ARGV\n"; #-------- Handle incoming option # In this example, our command may be run with # -v -h and -i options (which will get set into # variable $opt_v, etc) $status = getopts('vhi'); if ($status) { print "I am happy\n"; } else { # Error message and exit # $0 is the program name die "$0: I am sad\n"; } #-------- End of option handling #------- MUST have a file name ----- die ("$0: file name misd\n") unless(@ARGV); $opt_i and print("Interactive\n"); $opt_h and print("Ha, ha! No help!\n"); $opt_v and print("Verbose mode selected\n"); print "Cooked parameters: @ARGV\n"; __END__ Sample output: Dorothy:p82 grahamellis$ perl gop Raw parameters: I am happy gop: file name misd Dorothy:p82 grahamellis$ perl gop -iv course.perl book.perl Raw parameters: -iv course.perl book.perl I am happy Interactive Verbose mode selected Cooked parameters: course.perl book.perl Dorothy:p82 grahamellis$ perl gop -ivf course.perl book.perl Raw parameters: -ivf course.perl book.perl Unknown option: f gop: I am sad Dorothy:p82 grahamellis$ Learn about this subject
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