unix bash questions

$1.$ create a file "mytest" $($use touch to do this$)$

$2.$ check the permissions on the file

$3.$ set the permission to user $=$ all, group $=$ none, other$/$world $=$ none; using $($r$,$w$,$x$,$

$+.-)$

$4.$ now add read permission to those in the same group

$5.$ now make sure that the file is readable by all, but that no user $($including

yourself$)$ can delete it$.$

$6.$ Verify this by trying to remove the file

$7.$ create a directory test$1$ and create a file within it called test$2$

$8.$ use a single command to give read and write permission to test$1$ and all its

descendants