关于grep的一个问题？

johnny_jiang

有如下代码：

1. 
   
2. 
   
3. bash# man bash | egrep '^SYNOPSIS'
   
4. bash# (nothing echo back)
   
5. 
   

复制代码

不知道为什么，请大家指教

yongjian

Post by johnny_jiang
有如下代码：

1. 
   
2. 
   
3. bash# man bash | egrep '^SYNOPSIS'
   
4. bash# (nothing echo back)
   
5. 
   

复制代码

不知道为什么，请大家指教

1. man bash | egrep '^SYNOPSIS'
   
2. Reformatting bash(1), please wait...
   
3. SYNOPSIS

复制代码

I have something returning back.

johnny_jiang

Post by yongjian

1. man bash | egrep '^SYNOPSIS'
   
2. Reformatting bash(1), please wait...
   
3. SYNOPSIS

复制代码

I have something returning back.

Is it related to certain bash version? I can't get anything returned.

So weird.

shizi4838

I have nothing to return back  too.

yongjian

bash                                      3.1-2ubuntu6
man-db                                    2.4.3-3
grep                                      2.5.1.ds2-4

晨想

我这里也没东西，，这个应该是 man 生成文件的差异，/etc/man.conf 里边是怎么写的？
我的：
NROFF           /usr/bin/nroff -Tlatin1 -mandoc

yongjian

hmm.. interesting. I don't have that file.

johnny_jiang

Post by yongjian
hmm.. interesting. I don't have that file.

I don't,either.

bash-3.0-15
man-2.4.1-221
grep-2.5.1a-4