Passing bash variable into inline perl script - bash

Question

Reference the 2nd to last line in my script. For some reason Perl is not able to access the variable $perlPort how can I fix this? Note: $perlPort is a bash variable location before my perl script
perl -e '
{
package MyWebServer;
use HTTP::Server::Simple::CGI;
use base qw(HTTP::Server::Simple::CGI);
my %dispatch = (
"/" => \&resp_hello,
);
sub handle_request {
my $self = shift;
my $cgi = shift;
my $path = $cgi->path_info();
my $handler = $dispatch{$path};
if (ref($handler) eq "CODE") {
print "HTTP/1.0 200 OK\r\n";
$handler->($cgi);
} else {
print "HTTP/1.0 404 Not found\r\n";
print $cgi->header,
$cgi->start_html("Not found"),
$cgi->h1("Not found"),
$cgi->end_html;
}
}
sub resp_hello {
my $cgi = shift; # CGI.pm object
return if !ref $cgi;
my $who = $cgi->param("name");
print $cgi->header,
$cgi->start_html("Hello"),
$cgi->h1("Hello Perl"),
$cgi->end_html;
}
}
my $pid = MyWebServer->new($perlPort)->background();
print "Use 'kill $pid' to stop server.\n";'

Answer 1

export perlPort
perl -e '
...
my $pid = MyWebServer->new($ENV{perlPort})->background();
'

Answer 2

You can use -s switch to pass variables. See http://perldoc.perl.org/perlrun.html
perl -se '
...
my $pid = MyWebBrowser->new($perlPort)->background();
...' -- -perlPort="$perlPort"

Answer 3

You can still pass command line arguments to your script. Replace $perlPort with $ARGV[0], then call you script as
perl -e $' ...
my $pid = MyWebServer->new($ARGV[0])->background();
print "Use \'kill $pid\' to stop server.\n";' "$perlPort"
Note the other problem: You can't include single quotes inside a single-quoted string in bash. You can work around this by using a $'...'-quoted string as the argument to Perl, which can contain escaped single quotes. If your script doesn't need to read from standard input, it would be a better idea to have perl read from a here-document instead.
perl <<'EOF' "$perlPort"
{
package MyWebServer;
use HTTP::Server::Simple::CGI;
...
my $pid = MyWebServer->new($ARGV[0])->background();
print "Use 'kill $pid' to stop server.\n";
EOF
The best idea is to simply use a script file instead of trying to construct the script on the command line.

Answer 4

perl -e '
...
my $pid = MyWebServer->new('$perlPort')->background();
...