unexpand: Convert spaces to tabs
unexpand writes the contents of each given file, or
standard input if none are given or for a file of `-', to
standard output, with strings of two or more space or tab characters
converted to as many tabs as possible followed by as many spaces as are
unexpand [option]... [file]...
unexpand converts only initial spaces and tabs (those
that precede all non space or tab characters) on each line. It
preserves backspace characters in the output; they decrement the column
count for tab calculations. By default, tabs are set at every 8th
The program accepts the following options. Also see section Common options.
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