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Null flush

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(Testing)
(Testing)
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cat <(echo -e "this here[][\n]\0is a[][\n]\0little[][\n]\0flushing test[][\n]\0") /dev/stdin | your -z | pipe -z | goes -z | here -z
 
cat <(echo -e "this here[][\n]\0is a[][\n]\0little[][\n]\0flushing test[][\n]\0") /dev/stdin | your -z | pipe -z | goes -z | here -z
 
</pre>
 
</pre>
where \0 are the nulls, and the [] are there because many of the tools expect a [][\n] at the end of a stream (all the deformatters put this at the end of the stream, try "echo bunnymen|apertium-destxt"). Use Ctrl-D (^D) to close the input that cat keeps open.
+
where \0 are the nulls, and the [] are there because many of the tools expect a [][\n] at the end of a stream (all the deformatters put this at the end of the stream, try <tt>echo bunnymen|apertium-destxt</tt>). Use Ctrl-D (^D) to close the input that cat keeps open.
   
 
[[Category:Terminology]]
 
[[Category:Terminology]]

Revision as of 09:42, 20 January 2014

Null flush is an option (-z) to most Apertium programs (and programs compatible with Apertium stream format) that flushes the output buffer upon receiving the \0 character instead of on end-of-file. This allows programs which call Apertium externally to keep a translator online, meaning they can avoid startup time for every translation.

To see how to use this in practice, read Daemon.

Testing

If you want to test that a pipe handles null flush correctly, you can use something like:

cat <(echo -e "this here[][\n]\0is a[][\n]\0little[][\n]\0flushing test[][\n]\0") /dev/stdin | your -z | pipe -z | goes -z | here -z

where \0 are the nulls, and the [] are there because many of the tools expect a [][\n] at the end of a stream (all the deformatters put this at the end of the stream, try echo bunnymen|apertium-destxt). Use Ctrl-D (^D) to close the input that cat keeps open.

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