The Unix 'tar' command on your system doesn't support the 'p' flag option. Unix Systems that have Perl installed on them and provide support for running CGI's. If your Unix system is running IRIX on SGI machines like my ISP, Best Communications Inc, you can use the 'C' executable code file 'cntX.cgi'. Pentium Pro systems running FreeBSD can use 'cnt.cgi'. A cgi-bin is a special directory designated in the config files of a web server to allow execution of CGI scripts in specified directories.
Most web platforms allow only files inside of a cgi-bin to be executed.
This can be changed and on many machines a .cgi extension has been implemented to let anyone use CGI scripts in their directory simply by changing the filenames to have a .cgi extension. If this has not been enabled on your system and you don't have a cgi-bin already, ask your system administrator if you can have access to execute CGI scripts on your server. A cgi-bin is needed to run the 'cnt.pl' script unless your system administrator has enabled .cgi extensions to be used in any directory. To find out if you can use CGI scripts, ask your system administrator. It tells the shell that is executing this script where the Perl binary is.