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format
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format formatString arg arg ...
This command generates a formatted string in the same
way as the C sprintf procedure (it uses sprintf in its
implementation). FormatString indicates how to format
the result, using % fields as in sprintf, and the
additional arguments, if any, provide values to be
substituted into the result. All of the sprintf
options are valid; see the sprintf man page for
details. Each arg must match the expected type from
the % field in formatString; the format command
converts each argument to the correct type (floating,
integer, etc.) before passing it to sprintf for
formatting. The only unusual conversion is for %c; in
this case the argument must be a decimal string, which
will then be converted to the corresponding ASCII
character value. Format does backslash substitution on
its formatString argument, so backslash sequences in
formatString will be handled correctly even if the
argument is in braces. The return value from format is
the formatted string.