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OpenDarwin 7.2.1 - man page for unexpand (opendarwin section 1)

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EXPAND(1)			   BSD General Commands Manual				EXPAND(1)

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

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

DESCRIPTION
     The expand utility processes the named files or the standard input writing the standard out-
     put with tabs changed into blanks.  Backspace characters are preserved into the output and
     decrement the column count for tab calculations.  The expand utility is useful for pre-pro-
     cessing character files (before sorting, looking at specific columns, etc.) that contain
     tabs.

     The unexpand utility puts tabs back into the data from the standard input or the named files
     and writes the result on the standard output.

     The following options are available:

     -a      (unexpand only) 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.

     -t tab1,tab2,...,tabn
	     Set tab stops at column positions tab1, tab2, ..., tabn.  If only a single number is
	     given, tab stops are set that number of column positions apart instead of the
	     default number of 8.

ENVIRONMENT
     The LANG, LC_ALL and LC_CTYPE environment variables affect the execution of expand and
     unexpand as described in environ(7).

DIAGNOSTICS
     The expand and unexpand utilities exit 0 on success, and >0 if an error occurs.

STANDARDS
     The expand and unexpand utilities conform to IEEE Std 1003.1-2001 (``POSIX.1'').

HISTORY
     The expand command appeared in 3.0BSD.

BSD					  April 21, 2002				      BSD
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