This script shuffles the lines of a text file, and then shows a line from that file, one by one, each time it's run.

shuffler.sh

#!/bin/sh
# Shuffler Bash Script
# Steve Lambert 2018-04-16

#  This script shuffles the lines of a text file, and then shows
#  a line from that file, one by one, each time it's run.

#   To use this script, create a config file at ~/.shufflerVar
#   This will hold variables that the script can call each time
#   it's run.
#   Create and populate it by running this command:
#     echo "linenumber=1" > ~/.shufflerVar
#   Then create your shuffled list by running this command.
#   Change the file names in the script to the names you'll use.
#     shuf ordered_list.txt > shuffled_list.txt

# this declares where the variables are stored: 
source ~/.shufflerVar

# this displays a line from the shuffled file
sed -n $linenumber\p shuffled_list.txt 

# this iterates the line number
linenumber=$((linenumber + 1))

# this saves the new line number to the config file
echo "linenumber=$linenumber" > ~/.shufflerVar

# this checks if the script has reached the last line of the file
# and resets and re-shuffles the list if so.
if [[ $linenumber -gt 30 ]]; then
    echo "linenumber=1" > ~/.shufflerVar
    gshuf orderedlist.txt > shuffled_list.txt
    # uncomment the next line for troubleshooting
    # echo "RESET TO 1" 
fi

# The End

Still working on this - want to add variables and make it more automatic...