linux 查看日志

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# linux 查看日志
  参考: https://juejin.cn/post/7157900335539814430

## 模糊匹配关键字,查看关键字所在行上面 5 行内容
  grep test a.txt -B5

## 模糊匹配关键字,查看关键字所在行下面 5 行内容
  grep test a.txt -A5

## 模糊匹配关键字,查看关键字所在行上下 5 行内容
  grep test a.txt -C5

## 模糊匹配多个关键字,使用 *.* 分隔,查看关键字所在行上下 5 行内容
  grep testA*.*testB a.txt -C5

## a.txt
   aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
   bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
   dddddddddddddddddddddddddddddddddddddddd
   eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
   ffffffffffffffffffffffffffffffffffffffff
   gggggggggggggggggggggggggggggggggggggggg
   hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
   iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
   jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj
   kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk
   llllllllllllllllllllllllllllllllllllllll
   mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
   nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn
   oooooooooooooooooooooooooooooooooooooooo
   pppppppppppppppppppppppppppppppppppppppp
   qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq
   rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr
   ssssssssssssssssssssssssssssssssssssssss
   tttttttttttttttttttttttttttttttttttttttt
   test1
   uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu
   vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
   wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww
   xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
   yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
   zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
   aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
   bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb
   dddddddddddddddddddddddddddddddddddddddd
   eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
   ffffffffffffffffffffffffffffffffffffffff
   gggggggggggggggggggggggggggggggggggggggg
   hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
   iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
   jjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjjj
   kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk
   llllllllllllllllllllllllllllllllllllllll
   mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
   nnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn
   oooooooooooooooooooooooooooooooooooooooo
   pppppppppppppppppppppppppppppppppppppppp
   qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq
   rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr
   ssssssssssssssssssssssssssssssssssssssss
   tttttttttttttttttttttttttttttttttttttttt
   test2
   uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu
   vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
   wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww
   xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
   yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy
   zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz