如何在指定的行前面加入一行

寂寞烈火

waker is right~~~
lee@/home/lee#cat a
abc
home
end
lee@/home/lee#ed a<<EOF
> /home/i
> new line
> .
> w
> q
> EOF
13
22
lee@/home/lee#cat a
abc
new line
home
end
lee@/home/lee#

Shell_HAT

What should we do if you have more than one "home"?
I mean I want to add "new line" above every "home".

$ cat urfile
a
home
b
home
$ ed -s urfile <<\EOF
> /home/i
> new line
> .
> w
> q
> EOF
$ cat urfile
a
new line
home
b
home
$

yuhe27913

原帖由 waker 于 2008-6-10 08:56 发表
ed -s urfile <<\EOF
/home/i
new line
.
w
q
EOF

赞！这几乎可以替代sed -f和awk -f啦。
每天逛shell版都有收获！
ed -s中的s是什么意思?silence?静默模式吗

寂寞烈火

you are right, too,

1. 
   
2. -s, -, --quiet, --silent   suppress diagnostics
   

复制代码

ShareThought

原帖由 寂寞烈火 于 2008-6-10 22:30 发表
waker is right~~~
lee@/home/lee#cat a
abc
home
end
lee@/home/lee#ed a new line
> .
> w
> q
> EOF
13
22
lee@/home/lee#cat a
abc
new line
home
end
lee@/home/lee#

在脚本中怎么写呢？

Shell_HAT

明白了，是sed版本的问题。

C:\ProgramMy\GnuWin32>sed "/home/i\new line" urfile
a
new line
home
b
new line
home

C:\ProgramMy\GnuWin32>sed --version
GNU sed version 4.1.5
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE,
to the extent permitted by law.