col reads from standard input and writes to standard output.
- -b, --no-backspaces
- Do not output any backspaces, printing only the last character written to each column position.
- -f, --fine
- Permit half-forward line feeds. Normally characters destined for a half-line boundary are printed on the following line.
- -h, --tabs
- Output tabs instead of multiple spaces.
- -l, --lines number
- Buffer at least number lines in memory. By default, 128 lines are buffered.
- -p, --pass
- 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.
- -x, --spaces
- Output multiple spaces instead of tabs.
- -V, --version
- Display version information and exit.
- -H, --help
- Display help text and exit.
- 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 column
- forward line feed (10); also does carriage return
- carriage return
- shift in
- shift to normal character set (15)
- shift out
- shift to alternate character set (14)
- moves forward one column (32)
- 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.