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`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 spaces.  Synopsis:

     expand [OPTION]... [FILE]...

   By default, `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 Note: Common

`-t TAB1[,TAB2]...'
     If only one tab stop is given, set the tabs TAB1 spaces apart
     (default is 8).  Otherwise, set the tabs at columns TAB1, TAB2,
     ... (numbered from 0), and replace any tabs beyond the last
     tabstop given with single spaces.  If the tabstops are specified
     with the `-t' or `--tabs' option, they can be separated by blanks
     as well as by commas.

     Only convert initial tabs (those that precede all non-space or
     non-tab characters) on each line to spaces.

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