Install libcgi-ssi-perl by entering the following commands in the terminal:
sudo apt update sudo apt install libcgi-ssi-perl
Description:
Perl module to use SSI from CGI scripts
CGI::SSI is meant to be used as an easy way to filter shtml through CGI scripts in a loose imitation of Apache's mod_include. If you're using Apache, you may want to use either mod_include or the Apache::SSI module instead of CGI::SSI. Limitations in a CGI script's knowledge of how the server behaves make some SSI directives impossible to imitate from a CGI script.
Homepage: https://metacpan.org/release/CGI-SSI
Version: 0.92-5
Section: universe/perl