COL(1) OpenBSD Reference Manual COL(1)NAMEcol - filter reverse line feeds and backspaces from input
SYNOPSIScol [-bfhx] [-l num]
DESCRIPTIONcol filters out reverse (and half-reverse) line feeds so that the output
is in the correct order with only forward and half-forward line feeds,
and replaces whitespace characters with tabs where possible.
col reads from the standard input and writes to the standard output.
The options are as follows:
-b Do not output any backspaces, printing only the last character
written to each column position. This can be useful in
processing the output of mandoc(1).
-f Forward half-line feeds are permitted (``fine'' mode). Normally
characters printed on a half-line boundary are printed on the
following line.
-h Compress spaces into tabs. This is the default behavior.
-l num Buffer at least num lines in memory. By default, 128 lines are
buffered.
-x Output multiple spaces instead of tabs.
The control sequences for carriage motion that col understands and their
decimal values are listed in the following table:
ESC-7 Reverse line feed (escape then 7).
ESC-10 Half reverse line feed (escape then 10).
ESC-11 Half forward line feed (escape then 11).
backspace Moves back one column (8); ignored in the first column.
carriage return (13)
newline Forward line feed (10); also does carriage return.
shift in Shift to normal character set (15).
shift out Shift to alternate character set (14).
space Moves forward one column (32).
tab Moves forward to next tab stop (9).
vertical tab Reverse line feed (11).
All unrecognized control characters and escape sequences are discarded.
col keeps track of the character set as characters are read and makes
sure the character set is correct when they are output.
If the input attempts to back up to the last flushed line, col will
display a warning message.
SEE ALSOexpand(1)HISTORY
A col command appeared in Version 6 AT&T UNIX.
OpenBSD 4.9 October 29, 2010 OpenBSD 4.9