Answer-To change mode of myfile to 'rwxr–r–' , the command used is

The chmod command is used to change the permissions of a file or directory. In this case, the myfile is being changed to rwxr--r--, which means the owner has read, write, and execute permissions, while the group and others have only read permission. The numbers in the command represent the permissions in octal form, with the first digit representing the owners permissions, the second digit representing the groups permissions, and the third digit representing others permissions.