[#BloombergLP-balcl-CommandLine-printUsage-0d]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/balcl.adoc[balcl]::xref:BloombergLP/balcl/CommandLine.adoc[CommandLine]::printUsage
:relfileprefix: ../../../
:mrdocs:

Print usage to the specified output `errorStream`, describing what the command line should look like. If `errorStream` is not specified, print usage to `stderr`. Optionally specify `programName` to use as the name of the program in the printed usage. If `programName` is not specified and if `parse` has been previously called successfully, use the first element of the `argv` argument; otherwise, use a default name. This method can be invoked at any time, even before `parse` has been invoked on this object.

== Synopsis

Declared in `<balcl_commandline.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
printUsage() const;
----


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