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The following page has been changed by OlgaN:
http://wiki.apache.org/pig/PigStreamingFunctionalSpec

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     * If the first word on the streaming command is `perl` or `python`, pig 
would assume that the binary is the first string it encounters that does not 
start with dash.
     * Otherwise, pig will attempt to ship the first string from the command 
line as long as it does not come from `/bin, /user/bin, /user/local/bin, 
/home/y/bin`. It will determine that by scanning the path if an absolute path 
is provided or by executing `which`.
  
- To prevent a command from being shipped, an empty list can be passed to 
=clause=.
+ To prevent a command from being shipped, an empty list can be passed to 
`clause`.
  
  ==== 2.2 Ability to cache data ====
  
  The approach described above works fine for binaries/jars and small data 
sets. For larger datasets, loading them at run time for every execution can 
have serious performance consequences. 
  
- Similarly to 2.1, a user will be able to specify files to cache via =cache= 
clause in the define statement. For instance,
+ Similarly to 2.1, a user will be able to specify files to cache via `cache` 
clause in the define statement. For instance,
  
  {{{
  define X `stream.pl foo.gz` ship('stream.pl') cache('foo.gz')

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