XI. Nifty things not essentially related to Gopher
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Bruce Tanner's search engine, QUERY.EXE, has an interactive mode.  If there 
are 2 or fewer command line arguments, it will go into interactive mode.  If 
given all 5 arguments, it behaves as if it is running under a gopher server.  
If the first argument is missing, it will prompt for a idx/sel file name.  If 
the second argument is missing, it will prompt for a query string.  Here are 
several ways to invoke the search:

$ run gopher_root:[server]QUERY
Index file to search: gopher_root:[data.gopher]server
Enter query: shell
There are 7 topics found:
1.  I. Overview of the PSU/LCS OpenVMS Internet Gopher Server.
2.  II.  Setting Up Your Server.
3.  VI.d Setting Up Searches
4.  VI.d.2 Shell searching
5.  VI.d.3 Building Indexes
6.  VI.e Setting up Scripts
7.  VIII.a Debugging a Shell Search

Select topic to view [0 to quit]: 0

 
$ query :== $gopher_root:[server]QUERY
$ query gopher_root:[data.gopher]server
Enter query: search
There are 14 topics found:
1.  I. Overview of the PSU/LCS OpenVMS Internet Gopher Server.
2.  DISCLAIMERS:
3.  II.  Setting Up Your Server.
4.  II.c Prepare the command files.
5.  II.d Configure the Gopher Server
6.  III. .LINKS and lookaside files
7.  VI.c Adding alternate directory trees
8.  VI.d Setting Up Searches
9.  VI.d.1 GREP searching
10.  VI.d.2 Shell searching
11.  VI.d.3 Building Indexes
12.  VI.d.4 Command searching
13.  VIII. Debugging your server
14.  VIII.a Debugging a Shell Search

Select topic to view [0 to quit]: 0


$gopher_doc :== $gopher_root:[server]QUERY gopher_root:[data.gopher]server

$ gopher_doc "shell and search"
There are 6 topics found:
1.  I. Overview of the PSU/LCS OpenVMS Internet Gopher Server.
2.  II.  Setting Up Your Server.
3.  VI.d Setting Up Searches
4.  VI.d.2 Shell searching
5.  VI.d.3 Building Indexes
6.  VIII.a Debugging a Shell Search

Select topic to view [0 to quit]: 0


This brings full-text boolean searches to non-gopher sites as well.
.