[英]Updating matching line with sed/grep
I need to replace pattern matching line with yet another string. 我需要用另一个字符串替换模式匹配行。
Example 例
line1
line2
the serial port is ttyS0
line4
I need to replace line containing ttyS0
as 我需要将包含
ttyS0
行替换为
line1
line2
You have to use usb interface
line4
How can I do that in sed (or grep) 我该如何在sed(或grep)中做到这一点
I tried sed 's/ttyS0/You have to use usb interface/' myfile
. 我试过
sed 's/ttyS0/You have to use usb interface/' myfile
。 But it replaces only the matching words from the line. 但是它仅替换行中匹配的单词。 I want to replace the complete line.
我要替换整行。
像这样:
sed 's/.*ttyS0.*/You have to use usb interface/' myfile
一种使用更改选项的方法:
sed '/ttyS0/c\You have to use usb interface' myfile
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