sed替換的問題

zbhdpx

在鳥哥私房菜中有以下示例:
[root@www ~]# nl /etc/passwd | sed '2a drink tea'
1 root:0:0:root:/root:/bin/bash
2 bin:1:1:bin:/bin:/sbin/nologin
drink tea
3 daemon:2:2:daemon:/sbin:/sbin/nologin

在第二行后插入 drink tea
我在freebsd 6.2下怎么試都不行，提示如下:
%nl /etc/passwd | sed '2a drink tea'
sed: 1: "2a drink tea": command a expects \ followed by text

這個是什么問題,怎樣寫才是正確的？

另外把命令寫到文件里執(zhí)行沒問題
%cat change.sed
#!/usr/bin/sed -f
2 a\
drink tea

./change.sed /etc/passwd 這樣是正常的.

L_kernel

正規(guī)的模式應(yīng)該是a后面加一個\的。

可能還是gnu的改進的sed

zbhdpx

以下在csh下邊試
%nl /etc/passwd | sed '2a\ drink tea'
sed: 1: "2a\ drink tea": extra characters after \ at the end of a command

我加了也是這樣，剛又試了一下，可能我用的是csh,


在sh下

# nl /etc/passwd | sed '2a\ drink tea'
sed: 1: "2a\ drink tea": extra characters after \ at the end of a command

# cat test.txt |sed '2c\
> AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
> '

HORSEFEATHERS SOFTWARE PRODUCT BULLETIN
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
  of Horsefeathers  software products  --  Horsefeathers  Business
  BASIC, BASIC  Librarian,  and LIDO.  These software products can
  fill  your    requirements    for    powerful,    sophisticated,
  general-purpose business  software providing you with a base for
  software customization or development.


這樣是正常的，

L_kernel

以下在csh下邊試
%nl /etc/passwd | sed '2a\ drink tea'
sed: 1: "2a\ drink tea": extra characters af ...
zbhdpx 發(fā)表于 2010-12-28 10:08

    bash和bourne shell都不行。同樣是在bsd 8.1當中。
nl /etc/passwd | sed '2a\ drink tea'

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.

%cat test.txt | sed '2a\ \回車
? AAAAAAAAAAAAAAAAAAAA \回車
? '回車
The honeysuckle band played all night long for only $90.
Too bad the disco floor fell through at 23:10.
AAAAAAAAAAAAAAAAAAAA
The local nurse Miss P.Neave was in attendance.

在csh下，上邊的操作是可行的，但是插入內(nèi)容不多于一行