輸出當(dāng)前登錄用戶:

$ who
whp       console      Mar 15 14:23 
whp       ttys000      Mar 15 14:23 
whp       ttys001      Mar 15 14:23 

將當(dāng)前登錄用戶作為標(biāo)準(zhǔn)輸入, 通過grep 搜索關(guān)鍵詞‘000’:

$ who | grep 000
whp       ttys000      Mar 15 14:23 

-v 選項(xiàng): 匹配非‘000’行:

$ who | grep -v 000 
hepingwang       console      Mar 15 14:23 
hepingwang       ttys001      Mar 15 14:23 

指定文件phonebook搜索‘xu’ :

$ cat phonebook 
Aqqlice Chen    999-000
Charles wang    888-987
Jack xu     899-333

$ grep xu phonebook 
Jack xu     899-333

列出當(dāng)前目錄下所有文件:

$ ls
books       intro_sed   nu      passwd      sub_users   testNew     testNew3    users2
intro       names       numbers     phonebook   test1       testNew2    users

當(dāng)前路徑下所有文件, 搜索‘whp’ :

$ grep whp * 
sub_users:whp       ttys002      Mar 15 14:23 
sub_users:whp       ttys003      Mar 15 14:23 
users:whp       console      Mar 15 14:23 
users:whp       ttys000      Mar 15 14:23 
users:whp       ttys001      Mar 15 14:23 
users:whp       ttys002      Mar 15 14:23 
users:whp       ttys003      Mar 15 14:23 
users:whp       ttys004      Mar 15 14:23 
users2:whp       console      Mar 15 14:23 
users2:whp       ttys000      Mar 15 14:23 
users2:whp       ttys001      Mar 15 14:23 
users2:whp       ttys002      Mar 15 14:23 
users2:whp       ttys003      Mar 15 14:23 
users2:whp       ttys004      Mar 15 14:23 

-l 選項(xiàng), 列出包含 ‘whp’ 的文件

$ grep -l whp *  
sub_users
users
users2

-n 選項(xiàng),增加行號(hào)

$ grep -n whp users
1:whp       console      Mar 15 14:23 
2:whp       ttys000      Mar 15 14:23 
3:whp       ttys001      Mar 15 14:23 
4:whp       ttys002      Mar 15 14:23 
5:whp       ttys003      Mar 15 14:23 
6:whp       ttys004      Mar 15 14:23