VAR>filter</VAR> can be any program that reads a translation from standard
input and writes a modified translation to standard output.  A frequently
used filter is <SAMP>`sed&acute;</SAMP>.

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Note: It is your responsibility to ensure that the <VAR>filter</VAR> can cope
with input encoded in the translation catalog's encoding.  If the
<VAR>filter</VAR> wants input in a particular encoding, you can in a first step
convert the translation catalog to that encoding using the <SAMP>`