Command-line parameters are sent to a Perl program
in the same way they're sent to any other.
% ./myprog foo bar blat
The @ARGV array holds the command-line arguments,
and in this case, it would hold ('foo', 'bar',
'blat').
Perl allows for simplistic command-line options
via the -s option to perl:
#!/usr/bin/perl -s
print "value of -x: $x\n";
print "value of -name: $name\n";
Here's a sample run:
% ./myprog -x -name=Jeff
value of -x: 1
value of -name: Jeff
If you want more complex option parsing, there are
two standard modules that can do this for you:
Getopt::Std and Getopt::Long.
Perl allows you to treat the arguments in @ARGV as
filenames, by using the special case of the <>
operator.
while (<>) {
# $ARGV is the filename
# $_ is the line
# $. is the line number
# reset it to 0 by doing
# $. = 0 if eof;
# or
# close ARGV if eof;
}
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|