system command problem!

htruong · Jul 11, 2001

I use Perl to write a short program for optimize Netscape iPlanet Server that compiles an application in JavaScript Server side by jasc command. My simple source code as:

#############################################################
#!/usr/bin/perl

print "Content-type:text/html\n\n";

$main_dir = "document-root/my_directory";
$web_file = "my_web.web";
$ENV{'PATH'} = '/opt/netscape/suitespot/bin/https/bin';
$ENV{'LD_LIBRARY_PATH'} = '/opt/netscape/suitespot/bin/https/lib';
$st = "jsac -p \"$main_dir\" -f list.txt -o $web_file -r error.txt" ;

print "<HTML><BODY>";
system($st);
print "Generating success!&quot

;
print "</BODY></HTML>";
exit;
#############################################################
I saved this file as run.cgi

The jasc running well but allways display these line:
"JavaScript Application Compiler Version 24.13
Copyright (C) Netscape Communications Corporation 1996 1997
All rights reserved."

When I sumbit my HTML form with action is run.cgi and method POST server always return an error message like "The page can not display...". Then I view my web server error file and get this line:

[11/Jul/2001:20:06:21] failure ( 2034): for host 203.162.49.43 trying to POST /cgi-bin/admin/run.cgi, cgieng_scan_headers reports: the CGI program /opt/netscape/suitespot/docs/cgi-bin/admin/run.cgi did not produce a valid header (name without value: got line "javascript application compiler version 24.13&quot

Please help me for ignoring any return message from SYSTEM command with Perl.

Thanks
Nguyen Truong

hmerrill · Jul 12, 2001

I don't fully understand what you want to do here - you have a perl cgi script that kicks off a Javascript compile, and it prints out "Generating success!". Does it seem like the output of the compile is getting mixed in with the STDOUT of your perl cgi script? What do you want to have happen here?

One thing wrong, that should actually cause a syntax error, is the

print "Generating success!&quot

;

The right parenthesis does not belong.
Hardy Merrill
Mission Critical Linux, Inc.

http://www.missioncriticallinux.com

tsdragon · Jul 12, 2001

Before you print anything to the browser you need to print a content-type header. Try adding this line:

Code:

print &quot;Content-type: text/html\n\n&quot;;

That's a VERY common error in programs run as cgi programs.
Tracy Dryden
tracy@bydisn.com

Meddle not in the affairs of dragons,
For you are crunchy, and good with mustard.

hmerrill · Jul 12, 2001

Tracy, htruong is doing that as the first perl statement after #!/usr/bin/perl - that's one reason that this is kind of baffling.
Hardy Merrill
Mission Critical Linux, Inc.

http://www.missioncriticallinux.com

tsdragon · Jul 12, 2001

OOPS, I guess I missed that! :~/ Tracy Dryden
tracy@bydisn.com

Meddle not in the affairs of dragons,
For you are crunchy, and good with mustard.

htruong · Jul 12, 2001

Thank for you sugesstions,
To hmerrill,
I was mistake when write this code in posting message. The error message of website is not talking about this systax error!

print "Generating success!&quot

;

You know, when I type jasc from unix command like this:
#jasc -p "/opt" -f list.txt -o $web_file -r error.txt
I always get this message.
JavaScript Application Compiler Version 24.13
Copyright (C) Netscape Communications Corporation 1996 1997
All rights reserved.
#
So, it is a reason I see error message in my Web server when runing source code. I mean, I dont want any notice from result of SYSTEM command in Perl. (like silent running)

OK, I will try compile this code with - option for compiler.

Arion23 · Jul 12, 2001

Couple of things you might try are:

print "<HTML><BODY>";
print "";
print "Generating success!&quot

;

which would enclose the output of the system command in HTML quotes, and won't be shown in the browser (still viewable in the source)

Another way would be to redirect the standard output for that command to a temp file - although, only having just started playing with Perl, not sure how you would do this - anyone?

goBoating · Jul 13, 2001

With the system call commented out, the code runs fine (minus the extra paren).
.... I don't see how ......... but, my first suspicion is that the web server process lacks sufficient priviledges to do something in the system call. I realize that does not immediately explain the invalid header. But, since the code runs without the system call.....

I would make sure that the files that the web server is trying to write to already exist and they are writable by the web daemon. Maybe temporarily touch them and chmod 777 just long enough to make this thing work. Then, go back and tighten the permissions as appropriate. Also, that all input files are visiable/readable from the web servers perspective.

also, might try this to make sure the $str string is what you mean it to be...
....
print "<HTML><BODY>";
print "$st\n";
# system($st); # temporarily commented out
print "Generating success!";
print "</BODY></HTML>";
....

HTH

keep the rudder amid ship and beware the odd typo

tsdragon · Jul 13, 2001

Try redirecting the output of the command to /dev/null:

Code:

system(&quot;$st >/dev/null&quot;);

Tracy Dryden
tracy@bydisn.com

Meddle not in the affairs of dragons,
For you are crunchy, and good with mustard.

htruong · Jul 17, 2001

I still can not fix this problem. mod off file is OK. Webserver give our an error message on "...name without value: got line..."

Please help me!

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system command problem!

htruong

Programmer

hmerrill

Programmer

tsdragon

Programmer

hmerrill

Programmer

tsdragon

Programmer

htruong

Programmer

Arion23

IS-IT--Management

goBoating

Programmer

tsdragon

Programmer

htruong

Programmer

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