You can use the #echo directive to reference environment variables.
For example, suppose you have set the environment variable $cat (for "category") in a high-level web page specification file:
#set cat = "Reference" ... #include <files/pikt/doc_page_top_files.cfg> ...You could then reference the value of the $cat environment variable in the doc_page_top_files.cfg file in this way:
#echo " =h1($cat)"In any of the config files, you may reference an environment variable specified in an earlier #set or #setenv directive in this way:
#include [/bin/echo "$foo"]which would have the same effect as the line
barassuming you had set foo equal to "bar" in an earlier #set or #setenv directive.
Alternatively, you could use the #echo directive:
#echo "$foo"This would be useful to achieve a form of crude parameter passing to #include files.
Returning to the web pages example, suppose you have a common header #include file that is mainly identical across all of your pages except for a few details, such as the page title. If you set the environment variable $title with the directive
#set title = "ACME Widgets: Product Information"you may subsequently reference $title in the header #include file with the directive
#echo "<title>$title</title>"After all preprocessing, the line would effectively be
<title>ACME Widgets: Product Information</title>See the pikt.org website for demonstrations of this advanced technique.
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