# ----------------------------------
# Answer file: Exercise#1 - exercise01commands.sh
# ----------------------------------
# -Ian! D. Allen - idallen@idallen.ca

# Q4 the current date and time
date

# Q5 the current working directory
pwd

# Q6 list of online users in all-lower-case
who | tr A-Z a-z

# Q7 size in bytes of the Unix password file
# (Note: Many ways to do this.)
ls -l /etc/passwd | awk '{print $5}'
# or
wc -c /etc/passwd | awk '{print $1}'
# or
cat /etc/passwd | wc -c
# or
wc -c </etc/passwd

# Q8 number of machine reboots in September
# (Note: The quotes are not necessary for these particular grep patterns.)
last | grep 'reboot' | grep 'Sep'

# Q9 count total users to log in on Tuesdays
# (Note: Don't match "Tue" in any other fields!)
# (Note: The quotes are not necessary for this particular grep pattern.)
last | awk '{print $4}' | grep 'Tue' | wc -l

# Q10 three users with most logins, sorted descending
last | awk '{print $1}' | sort | uniq -c | sort -nr | head -3

# Q11 five most frequent login host names, sorted ascending
# (Note: Continued onto second line using escaped newline at end.)
# (Note: The quotes are not necessary for this particular grep pattern.)
last -a | grep -v 'reboot' | awk '{print $10}' \
    | sort | uniq -c | sort -n | tail -5