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Full Discussion: (Perl) GetOptions
Top Forums Shell Programming and Scripting (Perl) GetOptions Post 302292576 by fearboy on Saturday 28th of February 2009 05:47:49 PM
Old 02-28-2009
thanks for the reply -

i actually looked at Getopt::Std in the beginning, and i don't think it's what i'm looking for. i also realized i could have been more specific about what i was trying to do. to that end, here's the relevant snippet from the existing bash script i'm trying to replicate:

Code:
while [ $# -gt 0 ]; do
case $1 in

-f)     findOnly=1; item=$2; shift 2;;
-v)     set -x; shift;;
-t)     daysBack=$2; shift 2;;
-d)     op=deliveries; shift;;
-h)     op=ham; shift;;
-s)     op=spam; shift;;
-A)     op=all; item=$2; shift;;

esac
done

as you can see, in a few of those cases, we're assigning a couple of variables at once, which is what's currently tripping me up. there's logic elsewhere that checks for which of those variables have been set, and prompts the user for anything that's missing. later on, the script simply calls 'op' - that is, whichever subroutine was defined by the flag(s) when the script was called. in bash, it was pretty easy, and i'm sure there's a way to replicate the logic in perl, i just can't get my head around it.

to be clear, the script wants to work with whatever it's given, whether it's a full set of flags & arguments, a partial set, or nothing at all...for that reason, i (think i) can't simply call a subroutine as soon as i see the flag for it (like -d for 'deliveries') because we need to finish assigning variables first, whether by looking at the rest of @ARGV or by prompting the user.

the only way i've been able to come up with is to 1) sort out any passed flags & arguments, 2) check for anything missing & poke at the user, and THEN 3) go do stuff. that seemed like the most sane approach, but i am, as i say, open to any suggestions.

thanks again to all,
-john.
 

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LEARN ABOUT NETBSD

shift

shift(1)							   User Commands							  shift(1)

NAME

       shift - shell built-in function to traverse either a shell's argument list or a list of field-separated words

SYNOPSIS

   sh
       shift [n]

   csh
       shift [variable]

   ksh
       * shift [n]

DESCRIPTION

   sh
       The positional parameters from $n+1 ... are renamed $1 ... . If n is not given, it is assumed to be 1.

   csh
       The  components of argv, or variable, if supplied, are shifted to the left, discarding the first component. It is an error for the variable
       not to be set or to have a null value.

   ksh
       The positional parameters from $n+1 $n+1 ... are renamed $1 ..., default n is 1. The parameter n can  be  any  arithmetic  expression  that
       evaluates to a non-negative number less than or equal to $#.

       On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

       1.  Variable assignment lists preceding the command remain in effect when the command completes.

       2.  I/O redirections are processed after variable assignments.

       3.  Errors cause a script that contains them to abort.

       4.  Words,  following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
	   able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation  are  not
	   performed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), ksh(1), sh(1), attributes(5)

SunOS 5.10							    15 Apr 1994 							  shift(1)
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