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- COL User Commands COL
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- NNAAMMEE
- col - filter reverse line feeds
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- SSYYNNOOPPSSIISS
- ccooll [ --bbffhh ]
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- DDEESSCCRRIIPPTTIIOONN
- _C_o_l reads the standard input and writes the standard output.
- It performs the line overlays implied by reverse line feeds
- (ESC-7 in ASCII) and by forward and reverse half line feeds
- (ESC-9 and ESC-8). _C_o_l is particularly useful for filtering
- multicolumn output made with the `.rt' command of _n_r_o_f_f and
- output resulting from use of the _t_b_l(1) preprocessor.
-
- Although _c_o_l accepts half line motions in its input, it nor-
- mally does not emit them on output. Instead, text that
- would appear between lines is moved to the next lower full
- line boundary. This treatment can be suppressed by the --ff
- (fine) option; in this case the output from _c_o_l may contain
- forward half line feeds (ESC-9), but will still never con-
- tain either kind of reverse line motion.
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- If the --bb option is given, _c_o_l assumes that the output dev-
- ice in use is not capable of backspacing. In this case, if
- several characters are to appear in the same place, only the
- last one read will be taken.
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- The control characters SO (ASCII code 017), and SI (016) are
- assumed to start and end text in an alternate character set.
- The character set (primary or alternate) associated with
- each printing character read is remembered; on output, SO
- and SI characters are generated where necessary to maintain
- the correct treatment of each character.
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- If the --hh option is given, _c_o_l converts white space to tabs
- to shorten printing time.
-
- All control characters are removed from the input except
- space, backspace, tab, return, newline, ESC (033) followed
- by one of 7, 8, 9, SI, SO, and VT (013). This last charac-
- ter is an alternate form of full reverse line feed, for com-
- patibility with some other hardware conventions. All other
- non-printing characters are ignored.
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- SSEEEE AALLSSOO
- troff(1), tbl(1)
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- BBUUGGSS
- Can't back up more than 128 lines.
- No more than 800 characters, including backspaces, on a
- line.
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- Sprite v1.0 May 16, 1986 1
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