[Nutch Wiki] Update of "bin/nutch crawl" by fha

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The following page has been changed by fha:
http://wiki.apache.org/nutch/bin/nutch_crawl

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  [-showThreadID]
  
- [-depth i]
+ [-depth i]: You can tell Nutch how deep it should crawl. If you don’t tell Nutch a value, it takes 3 as his standard parameter. 
+ For example if you say –depth 1, Nutch would only index the first level. Only if you say –depth 2 (or more) Nutch would make a link follow.
+  
  
- [-dir d] 
+ [-dir d]: You can choose the directory, where Nutch should save the index.
+ If you don’t choose a directory Nutch would create a own directory in the directory where you started the crawl.
+ Example of a –dir parameter: -dir /usr/local/index/ 
  
- [-threads n]
+ [-threads n]: You can choose, how many threads Nutch would use.
  
  -local