COL(1) User Commands COL(1)NAMEcol - filter reverse line feeds from input
DESCRIPTIONcol filters out reverse (and half-reverse) line feeds so the output is
in the correct order with only forward and half-forward line feeds, and
replaces white-space 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 output.
Do not output any backspaces, printing only the last character
written to each column position.
Forward half line feeds are permitted fine mode. Normally char‐
acters printed on a half-line boundary are printed on the fol‐
Force unknown control sequences to be passed through unchanged.
Normally, col will filter out any control sequences from the
input other than those recognized and interpreted by itself,
which are listed below.
Output tabs instead of multiple spaces.
Output multiple spaces instead of tabs.
-l, --lines number
Buffer at least number lines in memory. By default, 128 lines
Output version information and exit.
Output help and exit.
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-8 half reverse line feed (escape then 8)
ESC-9 half forward line feed (escape then 9)
backspace moves back one column (8); ignored in the
newline forward line feed (10); also does carriage
carriage return (13)
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), nroff(1), tbl(1)STANDARDS
The col utility conforms to the Single UNIX Specification, Version 2.
The -l option is an extension to the standard.
A col command appeared in Version 6 AT&T UNIX.
The col command is part of the util-linux package and is available from
Linux Kernel Archive ⟨ftp://ftp.kernel.org/pub/linux/utils/util-
util-linux September 2011 COL(1)