Create a crontab to perform the tasks listed below at the frequencies specified. Note that you do NOT need to write the actual scripts!
a) Run a backup script named local-backup from the /usr/local/adm directory every weekday at 11:30pm.
b) Execute a cleanup script named weekly-cleanly from the same directory above, every Friday at 4:30am.
c) Every night, produce a list of files that are world-writable.
d) Execute a reporting program, named twice-monthly from the /usr/local/bin directory on the 15th and 31st.
e) Execute a performance report script named perf23 every hour at 15 and 45 minutes after the hour on weekdays between the hours of 6:00am and 6:00pm. The script is located in root's home directory.