...The commands decide what to do with this data.
All data is handled as characters, by specifying an encoding. For binary data, the encoding ISO-8859-1 is used by default, has 256 single-byte characters. Data in the buffer is available as a charsequence to the commands for stuff like regex matching etc. The output can be redirected to a file, and an output encoding can be specified.The commands can also store/retrive arbitrary data for later use in a map. Evaluation of expressions in commands is done using Apache Jexl, and custom functions can also be used. ...