hi, you can use man chmod if you are in linux, example: file.txt if you want read write permission on file.txt chmod u+r+w+x file.txt # this will give permission of read, write, execute to only the owner of the file chmod g+r+w+x file.txt # this will give permission of read, write, execute to only to those users who belong to same group as you chmod o+r+w+x file.txt # this will give permission of read, write, execute to everyone who can see that file