kola4help
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Sep 20, 2012, 8:29 AM
Post #3 of 3
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Re: [BillKSmith] How to use Getopt module ??
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I recommend that you use one of the standard modules (Getopt::Std or Getopt::Long) instead. If you have a special requirement that these will not meet, tell us about it. test.pl (a sample from CPAN)
===
use Getopt::EvaP; # Evaluate Parameters
use subs qw/exit/;
sub exit {} # override builtin to check command line processing errors
@PDT = split /\n/, <<'end-of-PDT';
PDT sample
verbose, v: switch
command, c: string = D_SAMPLE_COMMAND, "ps -el"
scale_factor, sf: real = 1.2340896e-1
millisecond_update_interval, mui: integer = $required
ignore_output_file_column_one, iofco: boolean = TRUE
output, o: file = stdout
queue, q: key plotter, postscript, text, printer, keyend = printer
destination, d: application = `hostname`
tty, t: list of name = ("/dev/console", "/dev/tty0", "/dev/tty1")
PDTEND optional_file_list
end-of-PDT
@MM = split /\n/, <<'end-of-MM';
sample
A sample program demonstrating typical Evaluate Parameters
usage.
Examples:
sample
sample -usage_help
sample -h
sample -full_help
sample -mui 1234
.verbose
A 'switch' type parameter emulates a typical standalone
switch. If the switch is specified Evaluate Parameters
returns a '1'.
.command
A 'string' type parameter is just a list of characters,
which must be quoted if it contains whitespace.
NOTE: for this parameter you can also create and
initialize the environment variable D_SAMPLE_COMMAND to
override the standard default value for this command
line parameter. All types except 'switch' may have a
default environment variable for easy user customization.
.scale_factor
A 'real' type parameter must be a real number that may
contain a leading sign, a decimal point and an exponent.
.millisecond_update_interval
An 'integer' type parameter must consist of all digits
with an optional leading sign. NOTE: this parameter's
default value is '$required', meaning that
Evaluate Parameters ensures that this parameter is
specified and given a valid value. All types except
'switch' may have a default value of '$required'.
.ignore_output_file_column_one
A 'boolean' type parameter may be TRUE/YES/ON/1 or
FALSE/NO/OFF/0, either upper or lower case. If TRUE,
Evaluate Parameters returns a value of '1', else '0'.
.output
A 'file' type parameter expects a filename. For Unix
$HOME and ~ are expanded. For evap/Perl 'stdin' and
'stdout' are converted to '-' and '>-' so they can be
used in a Perl 'open' function.
.queue
A 'key' type parameter enumerates valid values. Only the
specified keywords can be entered on the command line.
.destination
An 'application' type parameter is not type-checked in
any - the treatment of this type of parameter is
application specific. NOTE: this parameter' default
value is enclosed in grave accents (or "backticks").
Evaluate Parameters executes the command and uses it's
standard output as the default value for the parameter.
.tty
A 'name' type parameter is similar to a string except
that embedded white-space is not allowed. NOTE: this
parameter is also a LIST, meaning that it can be
specified multiple times and that each value is pushed
onto a Perl LIST variable. In general you should quote
all list elements. All types except 'switch' may be
'list of'.
end-of-MM
EvaP \@PDT, \@MM; # evaluate parameters
===
Run as follows
perl test.pl -mui 10
perl test.pl -help
perl test.pl -mui 20 -command ps
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