sed打印的问题

zbhdpx

%cat test.txt
The honeysuckle band played all night long for only $90.
Too bad the disco floor fell through at 23:10.
The local nurse Miss P.Neave was in attendance.

我想打印出第二行，即包含at的行，

sed -n '/at/'p test.txt

现在是把第三行也打印出来了，中间的at,正则中可以用\bat\b来表示，使用sed怎么写？

zzy7186

sed '/\<at\>/p' urlfile

L_kernel

%cat test.txt
The honeysuckle band played all night long for only $90.
Too bad the disco floor fel ...
zbhdpx 发表于 2010-12-30 11:33

1. $ sed -n '2p' test.txt
   
2. Too bad the disco floor fell through at 23:10.
   
3. $ sed -n '/\<at\>/p' test.txt
   
4. Too bad the disco floor fell through at 23:10.
   

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zzy7186

修改下上面加个-n

zbhdpx

如上边的图，我这里还是不显示，估计是我的sed的版本问题，

sed -n '2p' test.txt

%sed -n '2p' test.txt
Too bad the disco floor fell through at 23:10.

这个是可以的，

L_kernel

如上边的图，我这里还是不显示，估计是我的sed的版本问题，

sed -n '2p' test.txt

%sed -n '2p'  ...
zbhdpx 发表于 2010-12-30 11:40

1. $ sed --version
   
2. GNU sed version 4.2.1
   
3. Copyright (C) 2009 Free Software Foundation, Inc.
   
4. This is free software; see the source for copying conditions.  There is NO
   
5. warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE,
   
6. to the extent permitted by law.
   
7. 
   
8. GNU sed home page: <http://www.gnu.org/software/sed/>.
   
9. General help using GNU software: <http://www.gnu.org/gethelp/>.
   
10. E-mail bug reports to: <bug-gnu-utils@gnu.org>.
    
11. Be sure to include the word ``sed'' somewhere in the ``Subject:'' field.
    

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昭襄王

grep ' at ' lines
Too bad the disco floor fell through at 23:10.

amarant

第三行也有at~
锚定一个词 \<xxx\>

zzy7186

回复 7# 昭襄王


    grep 是不是要加个-w的？
  我这里不加的话：
[root@PC_IN_LAN bashshell]#grep 'at' d
Too bad the disco floor fell through at 23:10.
The local nurse Miss P.Neave was in attendance.

昭襄王

回复  昭襄王


    grep 是不是要加个-w的？
  我这里不加的话：
[root@PC_IN_LAN bashshell]#grep ...
zzy7186 发表于 2010-12-30 11:50

仔细看我的