{ Begin a block of commands (end with a }).c \text Replace the selected lines with text, which has each embedded newline preceded by a backslash.d Delete pattern space. Start next cycle.D If pattern space contains no newline, start a normal new cycle as if the d command was issued....
Match every step’th line starting with line first. For example, ‘‘sed -n 1~2p’’ will print all the odd-numbered lines in the input stream, and the address 2~5 will match every fifth line, starting with the second. first can be zero; in this case, sed operates as if it were...
Match every step'th line starting with line first. For example, ```sed -n 1~2p''` will print all the odd-numbered lines in the input stream, and the address 2~5 will match every fifth line, starting with the second. first can be zero; in this case, sed operates as if it were ...
ba: If not the last line, returns to label ‘a’ s/\n/ /g: Finds and replaces newline (\n) with space (/ /). The pattern is matched globally (/g) The sed command loops through the steps until it reaches the last line, substituting all \n characters with space. Instead of thi...
$: Match the last line. 删除操作 sed 使用d命令来删除指定的行,man sed 的说明如下: d Delete pattern space. Start next cycle. 下面是几个使用d命令从输出结果中删除某些行的例子: 在输出结果中不打印filename文件的第一行: sed '1d' filename ...
for number in {1..4} do # replace this: #var=$(sed -n "s/.*\([^0-9]$number\.[^0-9]\).*/\1/p" file) # with this: var=$(sed -n "s/.*[^0-9]\($number\.[^0-9]\).*/\1/p" file) var="${var/./\\.}" echo $var sed -i "s/[[:space:]]*$var/\n$va...
Delete the initial segment of the pattern space through the first newline character and start the next cycle. [2addr]g Replace the contents of the pattern space with the contents of the hold space. [2addr]G Append a newline character followed by the contents of the hold space to the pat...
Replace the current line with the line ‘ 插入命令i #!/bin/sh sed ‘ /WORD/ i/ Add this line before every line with WORD ‘ 7.变换命令:y sed ‘y/abcdef/ABCDEF/’ <old该例将字符abcdef分别变成大写 8.将本行的控制符也显示出来的命令:l ...
Replace the selected lines with text, which has each embedded newline preceded by a backslash: c \ text Delete pattern space. Start next cycle: d Delete up to the first embedded newline in the pattern space. Start next cycle, but skip reading from the input if there is still data in ...
s (switch)选项通知sed这是一个替换操作,并查询pattern-to-find,成功后用replacement-pattern替换它。 替换选项如下: g (global)缺省情况下只替换第一次出现模式,使用g选项替换全局所有出现模式。 p (print) 缺省sed将所有被替换行写入标准输出,加p选项将使-n选项无效。-n选项不打印输出结果。