col (过滤来自输入的反向换行)

rose1 发表于 2020-08-24 10:29

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在类似Unix的操作系统上，col命令过滤来自输入的反向换行。本文档介绍了col的GNU / Linux版本。

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1 col 运行系统环境

2 col 说明

3 col 语法

Linux

col 实用程序筛选出反向（和半反向）换行，以便输出以正确的顺序，仅具有正向和半正向换点，并在可能的情况下将空白字符替换为选项卡。这在处理nroff和 tbl 的输出时非常有用。

col实用程序从标准输入读取，写入标准输出。

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col [-bfhpx] [-l num]

选项

-b	不要输出任何回格，只打印写入每个列位置的最后一个字符。
-f	允许向前半线馈送（"精细"模式）。通常，在半行边界上打印的字符打印在以下行上。
-h	不要输出多个空格而不是选项卡（这是默认值）。
-l num	缓冲区内存中至少数行。默认情况下，128 行进行缓冲。
-p	强制通过未更改的未知控制序列。通常，col会从输入中筛选出除其自身识别和解释的输入以外的任何控制序列（下面列出）。
-x	输出多个空格而不是选项卡。

col 理解的滑车运动的控制序列及其十进制值列在下表中：

丢弃所有无法识别的控制字符和转义序列。

col实用程序在读取字符时跟踪字符集，并确保字符集在输出时正确。

如果输入尝试备份到最后一个刷新的行，col将显示一条警告消息。

col [-bfhpx] [-l num]

-b	Do not output any backspaces, printing only the last character written to each column position.
-f	Forward half line feeds are permitted ("fine" mode). Normally characters printed on a half line boundary are printed on the following line.
-h	Do not output multiple spaces instead of tabs (This is the default).
-l num	Buffer at least num lines in memory. By default, 128 lines are buffered.
-p	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).
-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-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 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.

The col utility 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 displays a warning message.

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