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 Documented in Volume 1 of the UNIX Programmers Manual.

 % expand -20 filein > fileout
  will apply tab stops every twenty columns, and replace all tab characters
  with spaces. The default tab stop is every eight columns.

 % expand -10,15,20,50
  will expand the text with tabs set to columns 10, 15, 20 and 50.

 Printer tab definitions are in /usr/lib/term.

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