col - filter reverse line feeds from input
col filters out reverse (and half-reverse) line feeds so the output is in
the correct order, with only forward and half-forward line feeds. It also
replaces any whitespace characters with tabs where possible. This can be
useful in processing the output of nroff(1) and tbl(1).
col reads from standard input and writes to standard
Do not output any backspaces, printing only the last
character written to each column position.
Permit half-forward line feeds. Normally characters
destined for a half-line boundary are printed on the following line.
Output tabs instead of multiple spaces.
-l, --lines number
Buffer at least number lines in memory. By
default, 128 lines are buffered.
Force unknown control sequences to be passed through
unchanged. Normally col will filter out any control sequences other
than those recognized and interpreted by itself, which are listed below.
Output multiple spaces instead of tabs.
Display version information and exit.
Display help text and exit.
The col utility conforms to the Single UNIX Specification, Version 2. The
-l option is an extension to the standard.
The control sequences for carriage motion that col understands and their
decimal values are listed in the following table:
reverse line feed (escape then 7)
half reverse line feed (escape then 8)
half forward line feed (escape then 9)
moves back one column (8); ignored in the first
forward line feed (10); also does carriage return
shift to normal character set (15)
shift to alternate character set (14)
moves forward one column (32)
moves forward to next tab stop (9)
reverse line feed (11)
All unrecognized control characters and escape sequences are
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.
A col command appeared in Version 6 AT&T UNIX.