91                       be set at those specific column positions. Each tab-stop
  92                       position N must be an integer value greater than zero,
  93                       and the list must be in strictly ascending order. This
  94                       is taken to mean that, from the start of a line of
  95                       output, tabbing to position N will cause the next
  96                       character output to be in the (N+1)th column position on
  97                       that line. When the -t option is not specified, the
  98                       default is the equivalent of specifying -t 8 (except for
  99                       the interaction with -a, described below).
 100 
 101                       No space-to-tab character conversions occur for
 102                       characters at positions beyond the last of those
 103                       specified in a multiple tab-stop list.
 104 
 105                       When -t is specified, the presence or absence of the -a
 106                       option is ignored; conversion will not be limited to the
 107                       processing of leading blank characters.
 108 
 109 
 110 OPERANDS
 111        The following ooperand is supported for expand and unexpand:
 112 
 113        file
 114                 The path name of a text file to be used as input.
 115 
 116 
 117 ENVIRONMENT VARIABLES
 118        See environ(5) for descriptions of the following environment variables
 119        that affect the execution of expand and unexpand: LANG, LC_ALL,
 120        LC_CTYPE, LC_MESSAGES, and NLSPATH.
 121 
 122 EXIT STATUS
 123        The following exit values are returned:
 124 
 125        0
 126               Successful completion
 127 
 128 
 129        >0
 130               An error occurred.
 131 

  91                       be set at those specific column positions. Each tab-stop
  92                       position N must be an integer value greater than zero,
  93                       and the list must be in strictly ascending order. This
  94                       is taken to mean that, from the start of a line of
  95                       output, tabbing to position N will cause the next
  96                       character output to be in the (N+1)th column position on
  97                       that line. When the -t option is not specified, the
  98                       default is the equivalent of specifying -t 8 (except for
  99                       the interaction with -a, described below).
 100 
 101                       No space-to-tab character conversions occur for
 102                       characters at positions beyond the last of those
 103                       specified in a multiple tab-stop list.
 104 
 105                       When -t is specified, the presence or absence of the -a
 106                       option is ignored; conversion will not be limited to the
 107                       processing of leading blank characters.
 108 
 109 
 110 OPERANDS
 111        The following operand is supported for expand and unexpand:
 112 
 113        file
 114                 The path name of a text file to be used as input.
 115 
 116 
 117 ENVIRONMENT VARIABLES
 118        See environ(5) for descriptions of the following environment variables
 119        that affect the execution of expand and unexpand: LANG, LC_ALL,
 120        LC_CTYPE, LC_MESSAGES, and NLSPATH.
 121 
 122 EXIT STATUS
 123        The following exit values are returned:
 124 
 125        0
 126               Successful completion
 127 
 128 
 129        >0
 130               An error occurred.
 131