sed修改匹配行的连续三行数据（包含匹配行）

holetohole

一个文本a如下

a
b
c
d
ff
f
g
h
d
cc
g

现在要求匹配d
并且将d以及d以后的连续2行分别加上#，如下
a
b
c
#d
#ff
#f
g
h
#d
#cc
#g




似乎得用到sed的N ; P功能
对这个不是很熟悉，求助大家啊

zxy877298415

回复 1# holetohole

1. awk '/^d/{p=1}p==1&&t++<3{$0="#"$0}t>2{p=t=0}++n' file

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wh7211

回复 1# holetohole

1. awk '/d/{f=1}f{if(f<=3){$0="#"$0;f++}else{f=0}}1' a

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jason680

回复 1# holetohole

$ cat FILE
a
b
c
d
ff
f
g
h
dd
cc
g

$ awk -vk=d -vn=3 '$0~k{p=3}p{--p;$0="#"$0}1' FILE
a
b
c
#d
#ff
#f
g
h
#dd
#cc
#g

$ awk -vk=d -vn=3 '$0==k{p=3}p{--p;$0="#"$0}1' FILE
a
b
c
#d
#ff
#f
g
h
dd
cc
g

yinyuemi

回复 1# holetohole

sed '/d/{N;N;s/^/#/gM}'

1cpuer

回复 5# yinyuemi

M 是啥

yinyuemi

回复 6# 1cpuer

'M'
'm'
     The 'M' modifier to regular-expression matching is a GNU 'sed'
     extension which directs GNU 'sed' to match the regular expression
     in 'multi-line' mode.  The modifier causes '^' and '$' to match
     respectively (in addition to the normal behavior) the empty string
     after a newline, and the empty string before a newline.  There are
     special character sequences ('\`' and '\'') which always match the
     beginning or the end of the buffer.  In addition, the period
     character does not match a new-line character in multi-line mode.

1cpuer

回复 4# jason680

--p 不懂

WilliBhamlll

1. sed '/d/,+2s/^/#/'

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jason680

回复 8# 1cpuer

p = p-1