|
What is the version of Perl
We are currently running Perl version 5.00502
What is the path to Perl?rl?
Below are all of the paths to our perl binary:
/usr/bin/perl
/usr/local/bin/perl5.00502
/usr/local/bin/perl
Why can't I execute perl scripts from
shell?
You can but most likely you are using the wrong syntax. Do
not use the syntax "./ to execute your perl scripts through
Telnet, as you will get a "Permission denied: program not
allowed." error.
Instead, use the syntax "perl" to execute you perl scripts
though Telnet. This syntax will still return any standard
output or standard error returned by the script for
debugging purposes.
Does Nader Solution frequently upgrade
Perl with new build releases?
Yes. Once a new build of Perl has been deemed as stable
versus experimental, Nader Solution will promptly upgrade to
this version of Perl.
How should I set my file permissions on a
Perl script?
Often times, permissions are set very leniently in order to
avoid any permissions problem. This is not a good idea. Your
Perl scripts should have the appropriate permissions
depending on the function of that particular script.
First, all scripts should be set to the owner (you) having
read, write and execute privilege (rwx) regardless of the
function of the Perl script.
Next, you should ask yourself if you want people (visitors)
to your website to be able to execute the Perl script. This
is most likely the case. Under these conditions, your script
would be set to world readable and executable (r-x). Do not
give the world write permission on the Perl script! It is
not necessary and may lead to problems!
If your script is not going to be executed through the web
and only you will be executing the script through Telnet
(there are various reasons for having a script operate under
these conditions), then you set the script to no world
permissions (---).
The group permissions should be set to read and executable
(r-x) if the script is to be executable via the web.
Otherwise, set your group permissions to nothing (---).
With this information, you have the following permissions
breakdown:
Executed via the web by anyone: chmod 755
Executed by only yourself thought the command line: 700
Often times, a Perl script will open a file for writing.
This is the case in guest book's and bulletin boards, where
the information is received from the form and written to a
certain file. The permissions of this particular file are
now important.
Many times, the author of a Perl script you use on your
account will require you to set this file to rwxrw-rw-, or
chmod 766, which allows write access to the world. This is
not a good idea and is unnecessary.
Files that need to be written to by way of a Perl script can
be set to the default permissions of rw-r--r--, or chmod
644. This will work fine with our setup.
Finally, never set your file permissions to rwxrwxrwx, or
chmod 777. This is not necessary, may cause a security
problem on your website, and will cause your Perl script to
not execute at all!
What are the correct file extensions for
Perl scripts?
Your Perl scripts can have the extension .pl or .cgi.
However, Perl scripts that are going to produce output to
the web (world readable) would use the extension .cgi. Perl
scripts that are only meant to be executed by yourself via
the command line or even scripts which may be executed
through the web without any output should be set to the .pl
file extension.
Should I upload my Perl scripts in ASCII
or Binary mode?
You should always upload your Perl scripts in ASCII mode via
FTP. If you upload your scripts in binary mode, the scripts
will not work and you will get an "Internal Server Error:
Premature End of Script Headers" error (500 Internal Server
Error). It is very important to remember to only upload your
Perl scripts in ASCII mode!
How do I execute my Perl scripts through
Telnet/SSH?
Issue the command "perl " from the command line, where
"script name" is the relative or absolute path to the Perl
script. If problems with the execution of the script are
encountered, they will be reported on the terminal by the
Perl Debugger.
Can I use a "cgi-bin" on my account for my
Perl scripts?
Certainly. You may use a directory named "cgi-bin" or
anything you wish to for your Perl scripts.
Do my Perl scripts have to be in the
cgi-bin?
No. Sometimes a person thinks that their Perl scripts must
reside in the cgi-bin directory in order to work. This is
not true, there is nothing special about that directory.
This name has simply evolved out of tradition. You can use
this directory for your scripts, which is created on your
account when setup. However, feel free to put your Perl
scripts anywhere within your account.
|
