grep 过滤
参数：-v -B -C -A 使用
grep 参数：-i -o -E (正则)与egrep等
grep 参数-w 精准匹配查找的内容并输出所在行
[root@localhost scripts]#cat sedtext
qwerrrr
wewq
wew1
erw
wew
[root@localhost scripts]#grep "wew" sedtext
wewq
wew1
wew
[root@localhost scripts]#grep -w "wew" sedtext
wew
grep -n ".*" 显示行号输出 “.*” 代表任意字符
[root@localhost scripts]#grep -n ".*" sedtext
1:qwerrrr
2:
3:wewq
4:wew1
5:erw
6:wew wweweweefd
7:wew weww
8:wew
grep -E 或egrep 可以使用正则表达
[root@localhost scripts]#egrep -w "wew|fds" sedtext
wew wweweweefd
wew weww
wew
fds
