Unix / Linux shell command help.

Q7: Suppose that the file myFile is in your working directory. Specify a command that gives everybody permission to read myFile but does not change any other privileges. Q8: Specify a command that permit the owner and the group members to read and write the file while removing all privileges from anyone else. Q9: Specify a command that removes all privileges from anyone but the onwer. Q10: Specify a single line command that gives the onwer and the group permission to execute the file myFile, while giving the onwer sole permission to read and write the file. Remove permission of others to execute. Q11: Specify a single line command that gives the onwer and the group permission to execute the file myFile, while giving the onwer sole permission to read and write the file. Do not change any other permisions, i.e., do not remove permission from others to execute, if they already have that permission.