UNIX Shell Utilities

5. Cron is a job scheduling utility provided by Linux/Unix systems, and it allows for periodical execution of predefined commands. Cron jobs are defined using crontab files (You can read more about crontab files here http://www.adminschoice.com/crontab-quick-reference). Write a crontab line that creates an empty file named update.txt under the home directory at 6:32PM of every 7th, 14th, 21st and 28th days of every month. [4 pts] 6. i) Create an A4tmp directory in your home directory. ii) Read the man page for the find command. Find out all files (only files) within or below the /var/log directory that have a file size greater than 2000 bytes, while directing all stderr messages to a file called logerror.txt in the A4tmp directory in your home directory. [4 pts] 7. i) How many entries with .gz extension are there in the /usr/share/man/manl directory? ii) Within them, how many are not symbolic links? Note that in the output of ls -1, a symbolic link has letter 1 at the start of its line, it also has a" -> " sign in its line. [4 pts 8. i) How many words, lines and characters are there in /usr/share/dict/words respectively? ii) Based on the result in i), how many words are there on each line of the file? iii) Save the words between 100-200 and 400-600 (both inclusive) in this file to files named 100-200.txt and 400-600.txt in your /A4tmp directory, respectively. [4 pts