linux三剑客之老三grep

$ grep -rl love *
dir/file3.txt
file.txt
file2.txt

$ grep -inr "It doesn’T" *
dir/file3.txt:38:It doesn’t matter where 
file.txt:38:It doesn’t matter where 
file2.txt:38:It doesn’t matter where

$ grep -in "It doesn’T" file.txt -A 2 -B 2
file.txt-36-the way that ypu change my world
file.txt-37-when I’m with you
file.txt:38:It doesn’t matter where we're from and where
file.txt-39-as long as your with me all the way
file.txt-40-And the nights are long and lonely and

$ ps -ef | grep -i wei
  501 1807 1 0 25 519 ?? 5:29.55 /usr/bin/Weiyun -psn_0_176171
  501 92256 1851 0 10:32 grep --color=auto 
$ ps -ef | grep -i wei | grep -v grep
  501 1807 1 0 25 519 ?? 5:29.55 /usr/bin/Weiyun -psn_0_176171

$ grep -E "love|change" file.txt
I love you
I love you
the way that you change my world
Love may come and love may go

echo coding3min@foxmail.com | grep -p "^[A-Za-z0-9\u4e00-\u9fa5]\+\@[a-zA-Z0-9_-]\+\(\.[a-zA-Z0-9_-]\+\)"
coding3min@foxmail.com