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#!/bin/bash
# Output a sorted list of currently logged-in users, tfurrows@sdf.org
# Completely and utterly free, do whatever you want with this.
#defaults
c0="\e[0m" # color reset
c1="\e[32m" # title and total color
c2="\e[36m" # color of [letter]
c3="\e[33m" # color of user count per letter
c4="\e[35m" # color of known users (from ~/.whoiknow)
# Process arguments
while getopts "hc" opt; do
case $opt in
h)
printf "Usage: whoa [-ch]\n"
printf " -c removes all color, -h shows this message. \n"
printf " Place a text file named .whoiknow in your root, one login name per line, to highlight known users in the output.\n"
exit
;;
c)
# color off
c0=""
c1=""
c2=""
c3=""
c4="*"
;;
\?)
printf "Usage: whoa [-ch]\n"
printf " -c removes all color, -h shows this message. \n"
printf " Place a text file named .whoiknow in your root, one login name per line, to hi
ghlight known users in the output.\n"
exit;
;;
esac
done
# check for .whoiknow text file, read known usernames into array
declare knownUsers
if [ -f ~/.whoiknow ]; then
mapfile -t knownUsers < ~/.whoiknow
fi
# Get and sort user list
USERS="$(/usr/bin/who -q | sed -e '$d')"
array=(${USERS// / })
readarray -t sorted < <(for a in "${array[@]}"; do echo "$a"; done | sort -u)
# store in associative array
declare -A alphaUsers
for i in "${!sorted[@]}"
do
if [[ " ${knownUsers[@]} " =~ " ${sorted[i]} " ]]; then
alphaUsers["${sorted[i]:0:1}"]+="${c4}"${sorted[i]}"${c0}, "
else
alphaUsers["${sorted[i]:0:1}"]+=${sorted[i]}", "
fi
done
printf "\n ${c1}Alphabetical User List (logged in)${c0}\n"
for x in {a..z}
do
if [[ ! -z ${alphaUsers[$x]} ]]; then
countTemp="${alphaUsers[$x]//[^ ]}"
total="$(($total+${#countTemp}))"
countTemp=$(printf "%03d" ${#countTemp})
printf "\n [${c2}${x^}${c0}] [${c3}$countTemp${c0}] "
printf "${alphaUsers[$x]::-2}" #strip the last comma/space off
fi
done
printf "\n\n ${c1}$total users total${c0}"
printf "\n\n"