Detailed instructions on file permissions are beyond the scope of this guide, but in general:
- During installation and configuration, the CGI user needs to be able to read and write everything in the distribution,
- Once installation and configuration is complete, the CGI user needs write access to everything under the
dataandpubdirectories and tolib/LocalSite.cfg. Everything else should be read-only. - Everybody else should be denied access to everything, always.
The default location of Perl is
/usr/bin/perl. If it's somewhere else, change the path to Perl in the first line of each script in the twiki/bin directory. 
Some systems require a special extension on perl scripts (e.g. .cgi or .pl). If necessary, rename all files in twiki/bin (i.e. rename view to view.pl etc). If you do this, make sure you set the ScriptSuffix option in configure (Step 6).
/twiki/bin/LocalLib.cfg. There is a template for this file in
/twiki/bin/LocalLib.cfg.txt. The file must contain a setting for
$twikiLibPath, which must point to the absolute file path of your twiki/lib e.g. /home/httpd/twiki/lib. If you need to install additional CPAN modules, but can't update the main Perl installation files on the server, you can set $CPANBASE to point to your personal CPAN install. Don't forget that the webserver user has to be able to read those files as well.
bin/configure script from your browser. - Explicit instructions for doing this are beyond the scope of this document, though there is a lot of advice on TWiki.org covering different configurations of webserver. To help you out, there's an example Apache
httpd.conffile intwiki_httpd_conf.txtat the root of the package. This file also contains advice on securing your installation. There's also a script calledtools/rewriteshebang.plto help you in fixing up the shebang lines in your CGI scripts.
configure script from your browser, and resolve any errors or warnings it tells you about.
It is recommended to copy any settings or variables that you want to customize from 