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6ES7214-1BC01-0XB0 col(control)命令是一個標準輸入文本過濾器,它從標準輸入讀取內容,過濾掉控制字符反向換行符(RLF-ReverseLineFeed)和半反向換行符(HRLF-HaltRLF)后輸出到標準輸出。還可以將空白符用等價制表符(Tab)或空格(Space)來替換。
在許多Linux說明文件里,包含控制字符。當我們運用Shell特殊字符》和》》把說明文件的內容輸出成純文本文件時,控制字符會變成亂碼,col命令則能有效濾除這些控制字符。
2.命令格式
col[OPTIONS]
3.選項說明
-b,--no-backspaces不輸出任何退格符,只打印寫入每個列位置的最后一個字符-f,--fine允許正向半換行符(half-forwardlinefeeds)。通常,處于半行分界線上的字符打印在下一行-h,--tabs將多個空格轉換為Tab,一般4個空格轉為1個Tab-l,--linesNUMBER設置緩沖行為NUMBER,默認為128-p,--pass不轉換未識別的控制符-x,--spaces將Tab轉為多個空格,一般1一個Tab轉為4個空格-H,--help顯示幫助信息并退出-V,--version顯示版本信息并退出
4.常用示例
(1)將Tab替換為空格,一般1個Tab轉為4個空格。
echo-e“123456”|col-x
(2)將空格替換為Tab,一般4個空格轉為1個Tab。
echo-e“123456”|col-h
(3)將幫助文檔內的控制符刪除。以col命令的manual為例。
mancol|col-b》newFile
5.相關疑問
RLF字符(reverselinefeed)是反向換行符,HRLF字符(half-reverselinefeed)是半反向換行符。百度知道中有網友的回答,但是我還是不太清楚這兩個字符的作用和應用場景,請知道的大牛評論告知,萬分感謝。
6ES7214-1BC01-0XB0
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