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BSD 2.11 - man page for expand (bsd section 1)

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EXPAND(1)										EXPAND(1)

       expand, unexpand - expand tabs to spaces, and vice versa

       expand [ -tabstop ] [ -tab1,tab2,...,tabn ] [ file ...  ]
       unexpand [ -a ] [ file ...  ]

       Expand  processes  the  named files or the standard input writing the standard output with
       tabs changed into blanks.  Backspace characters are preserved into the output  and  decre-
       ment the column count for tab calculations.  Expand is useful for pre-processing character
       files (before sorting, looking at specific columns, etc.) that contain tabs.

       If a single tabstop argument is given, then tabs are set tabstop spaces apart  instead  of
       the  default  8.   If  multiple tabstops are given then the tabs are set at those specific

       Unexpand puts tabs back into the data from the standard	input  or  the	named  files  and
       writes  the  result  on the standard output.  By default, only leading blanks and tabs are
       reconverted to maximal strings of tabs.	If the -a option is given, then tabs are inserted
       whenever they would compress the resultant file by replacing two or more characters.

4th Berkeley Distribution		   May 9, 1986					EXPAND(1)
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