How to Change Default OS in Multi Boot System

Windows and Ubuntu dual-boot systems are set boot Ubuntu first by default, so I decided to change the dual-boot order to default to Windows.so when I start every time It will be set Ubuntu as Default OS and have to select within 10s Ubuntu or Windows until Enter the Default Selected OS. Most of us use Windows OS.

Unix/Linux Commands

Here I like to share with you that I learned few  Unix/Linux commands.



File Commands

1. ls :-Directory listing
2. ls -al :- Formatted listing with hidden files
3. ls -lt :-Sorting the Formatted listing by time modification
4. cd dir :-Change directory to dir
5. cd :-Change to home directory
6. pwd :-Show current working directory
7. mkdir dir :- Creating a directory dir
8. cat >file :-Places the standard input into the file
9. more file :-Output the contents of the file
10. head file:- Output the first 10 lines of the file
11. tail file :-Output the last 10 lines of the file
12. tail -f file:- Output the contents of file as it grows,starting with the last 10 lines
13. touch file :-Create or update file
14. rm file :-Deleting the file
15. rm -r dir :- Deleting the directory