#!/bin/bash
# one solution to day 3 activity
#
# CS 50, Fall 2022
# Tim Pierson, 2022
#
#set variable to point to password file so we don't have to keep typing the
#whole path
f=/thayerfs/courses/22fall/cosc050/workspace/activities/day3/passwd
echo "Using file: $f"

echo
echo "#1. Output the list of user full names, sorted alphabetically (remove duplicated occurrences of identical names)"
cut -d : -f 5 < $f | sort | uniq

echo
echo "#2. Count the number of users with ‘James’ as the first name."
grep 'James' $f | wc -l
#or better
#grep -c 'James' $f

echo
echo "#3. count the number of different shells used by all users."
cut -d : -f 7 $f | sort | uniq | wc -l

echo
echo "#4. output the number of users using each type of shell in the descending order."
cut -d : -f 7 $f | sort | uniq -c | sort -nr