I've never used the program. But if you search for "sgrep" with Google, you find it's home page. On the home page scroll down a bit to where it says "How is sgrep used". The following links in that section look particularly useful:
"using sgrep for querying structured text files"
"sgrep manual page"
If you want to cut right to the chase, go grab "sgrep-1.94a-doc.zip" from http://sourceforge.net/project/showf...ckage_id=16501
All the above popped right up by typing "sgrep" into Google. Although I've never used this program, it certainly doesn't appear to be lacking documentation on the web.