tools/perl-5.8.0/man/man3/Getopt::Std.3

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.IX Title "Getopt::Std 3"
.TH Getopt::Std 3 "2002-06-01" "perl v5.8.0" "Perl Programmers Reference Guide"
.SH "NAME"
getopt \- Process single\-character switches with switch clustering
.PP
getopts \- Process single\-character switches with switch clustering
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use Getopt::Std;
.Ve
.PP
.Vb 5
\&    getopt('oDI');    # -o, -D & -I take arg.  Sets $opt_* as a side effect.
\&    getopt('oDI', \e%opts);    # -o, -D & -I take arg.  Values in %opts
\&    getopts('oif:');  # -o & -i are boolean flags, -f takes an argument
\&                      # Sets $opt_* as a side effect.
\&    getopts('oif:', \e%opts);  # options as above. Values in %opts
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fIgetopt()\fR function processes single-character switches with switch
clustering.  Pass one argument which is a string containing all switches
that take an argument.  For each switch found, sets \f(CW$opt_x\fR (where x is the
switch name) to the value of the argument if an argument is expected,
or 1 otherwise.  Switches which take an argument don't care whether
there is a space between the switch and the argument.
.PP
The \fIgetopts()\fR function is similar, but you should pass to it the list of all
switches to be recognized.  If unspecified switches are found on the
command\-line, the user will be warned that an unknown option was given.
.PP
Note that, if your code is running under the recommended \f(CW\*(C`use strict
\&'vars'\*(C'\fR pragma, you will need to declare these package variables
with \*(L"our\*(R":
.PP
.Vb 1
\&    our($opt_x, $opt_y);
.Ve
.PP
For those of you who don't like additional global variables being created, \fIgetopt()\fR
and \fIgetopts()\fR will also accept a hash reference as an optional second argument.
Hash keys will be x (where x is the switch name) with key values the value of
the argument or 1 if no argument is specified.
.PP
To allow programs to process arguments that look like switches, but aren't,
both functions will stop processing switches when they see the argument
\&\f(CW\*(C`\-\-\*(C'\fR.  The \f(CW\*(C`\-\-\*(C'\fR will be removed from \f(CW@ARGV\fR.