xec</CODE> program applies a command to all translations of a
translation catalog.
The <VAR>command</VAR> can be any program that reads a translation from standard
input.  It is invoked once for each translation.  Its output becomes
msgexec's output.  <CODE>msgexec</CODE>'s return code is the maximum return code
across all invocations.

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A special builtin command called <SAMP>`0&acute;</SAMP> outputs the translation, followed
by a null byte.  The output of <SAMP>`msgexec 0&acut