如何反转grep命令的输出？

Question

i have one problem with grep command. in my called script i use:

   "ServicePassword":fooooooooooo
   "ServiceUserName":barrrrrrrrr
grep -E '"ServiceUserName"|"ServicePassword"' >> user.txt

but in user.txt file i will get first "ServicePassword":fooooooooooo then "ServiceUserName":barrrrrrrrr How can i use grep command to reverse it to get first ServiceUserName then ServicePassword output in user.txt file ? I need it only this sequence. i try to change:

grep -E '""ServicePassword""|"ServiceUserName"' >> user.txt

and nothing.... maybe exist a better solution?

Answer 1

grep 只是过滤器， man grep : print lines matching a pattern ，必须使用另一个工具来改变顺序，因为只有两个项目可能添加|sort或|sort -r （反向排序）可以提供帮助。

grep -E '"ServiceUserName"|"ServicePassword"' | sort -r >> user.txt

Answer 2

You can use and adapt the tac command below:

$ cat test.txt
"ServicePassword":fooooooooooo
"ServiceUserName":barrrrrrrrr

$ egrep '"ServicePassword"|"ServiceUserName"' test.txt | tac
"ServiceUserName":barrrrrrrrr
"ServicePassword":fooooooooooo

Answer 3

Use awk :

awk '/ServicePassword/{pwd=$0};/ServiceUserName/{user=$0};
     END{printf pwd; print user}' 

Answer 4

使用tac （与cat相对）

grep -E '"ServiceUserName"|"ServicePassword"' | tac >> user.txt