Answer the find questions below:

a. Write the command line that will find the files that start with the word 'sys' and end with '21' in our active directory. (ex: sys_log.s21)

b. In the same command line, add a command that will delete found files after asking us before each operation and receiving a positive response.

c. This command line generates also some error messages along with the find results. Add the grep command, to the command line you typed in item (a) , that would suppress the "permission denied" error (STDERR).

d. Interpret the following command line (Guidance: first explain each component and then the result to be obtained).

$ find / -ls -print