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Diff for /src/usr.bin/colrm/colrm.1 between version 1.8 and 1.9

version 1.8, 2011/12/28 22:27:18 version 1.9, 2016/01/18 20:31:36
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 .Sh DESCRIPTION  .Sh DESCRIPTION
 .Nm  .Nm
 removes selected columns from the lines of a file.  removes selected columns from the lines of a file.
 A column is defined as a single character in a line.  
 Input is read from the standard input.  Input is read from the standard input.
 Output is written to the standard output.  Output is written to the standard output.
 .Pp  .Pp
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 column will be written.  column will be written.
 Column numbering starts with one, not zero.  Column numbering starts with one, not zero.
 .Pp  .Pp
 Tab characters increment the column count to the next multiple of eight.  Each character occupies the number of columns defined by
 Backspace characters decrement the column count by one.  .Xr wcwidth 3 .
   Zero-width characters belong to the previous column rather
   than to the following column.
   If deletion of half of a double-width character is requested,
   its remaining half is replaced by a blank character.
   Non-printable characters are treated as if they had width 1.
   Each invalid byte is regarded as a non-printable character.
   .Pp
   Tab characters increment the input column count to the next multiple
   of eight.
   If they intersect or follow a deletion, they are expanded to blank
   characters such that the original alignment is preserved.
   .Pp
   Backspace characters decrement the column count by the width of the
   previous character.
   If they follow a character that is completely or partially deleted,
   they are deleted together with that character.
   If they follow a character that is partially deleted,
   they also suppress printing of the replacement blank character.
   .Pp
   For compatibility with
   .St -p1003.1-2008
   .Xr fold 1 ,
   if a double-width character is followed by two backspace characters
   instead of the usual one, both are regarded as belonging to that
   character, and the second one does not decrement the column count.
   .Sh ENVIRONMENT
   .Bl -tag -width LC_CTYPE
   .It Ev LC_CTYPE
   The character set
   .Xr locale 1 .
   It decides which sequences of bytes are treated as characters,
   and what their display width is.
   If unset or set to
   .Qq C ,
   .Qq POSIX ,
   or an unsupported value, each byte except tab and backspace is treated
   as a character of width 1.
   .El
 .Sh SEE ALSO  .Sh SEE ALSO
 .Xr awk 1 ,  .Xr awk 1 ,
 .Xr column 1 ,  .Xr column 1 ,
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 wrote the original version of  wrote the original version of
 .Nm  .Nm
 in November 1974.  in November 1974.
   .Sh BUGS
   If two characters of different widths are followed by two backspace
   characters in a row, the column count is decremented twice by the
   width of the second character rather than by the sum of both widths.
   This is hardly a practical problem because not even backspace
   encoding in
   .Xr roff 7
   style uses such double-backspace sequences.
Legend:
Removed from v.1.8  
changed lines
  Added in v.1.9