expand: Convert tabs to spaces
expand writes the contents of each given file, or standard
input if none are given or for a file of `-', to standard
output, with tab characters converted to the appropriate number of
expand [option]... [file]...
expand converts all tabs to spaces. It preserves
backspace characters in the output; they decrement the column count for
tab calculations. The default action is equivalent to `-8' (set
tabs every 8 columns).
The program accepts the following options. Also see section Common options.
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