Write down the commands for the following operations $($a$-$f$)$:a$.$a$.$a$.$a$.$ Write the complete command to schedule a reboot of the system $($Linux$)$ at $8$ AM$.$b$.$b$.$b$.$b$.$ Write down the command to find out the whole word Institutions from a text file namedUniversities.txt in a case sensitive manner.c$.$c$.$c$.$c$.$ Using Method$-1$ for chmodchmodchmodchmod, set permission for CDUInfoCDUInfoCDUInfoCDUInfo$\_\_\_\_2000200020002000.$txt$.$txt$.$txt$.$txt in the format $----$wwwwxxxx rrrrwwww$--------$wwww$----.$d$.$d$.$d$.$d$.$ Using Method$-2$ for chmodchmodchmodchmod, Deny ReadReadReadRead and WriteWriteWriteWrite permission to others and owner forCDUInfo$\_$CDUInfo$\_$CDUInfo$\_$CDUInfo$\_1985198519851985.$txt$.$txt$.$txt$.$txt$,$ but leave the ExecuteExecuteExecuteExecute permission intact.e$.$e$.$e$.$e$.$ Append the text This is an additional line of information to an existing text file namedNewFile.txtNewFile.txtNewFile.txtNewFile.txt$....$f$.$f$.$f$.$f$.$ Write down the command for listing files with long descriptions and sort it based on themodification time. Ensure that the hidden files are also displayed