示例
# 用法一
$ grep "\w" regFile
said
soid
suud
sooooood
1214
124155
112aaaaa
aad..asdasd
aa sets
# 用法二
$ cat regFile | grep "\w"
said
soid
suud
sooooood
1214
124155
112aaaaa
aad..asdasd
aa sets
-n 显示行数
$ grep -n "\w" regFile
1:said
2:soid
4:suud
7:sooooood
9:1214
10:124155
11:112aaaaa
13:aad..asdasd
14:aa sets
-v 取反
$ grep "^s" regFile
said
soid
suud
sooooood
$ grep -v "^s" regFile
1214
124155
112aaaaa
aad..asdasd
aa sets
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