takes a list of people on stdin and generates files with assassin targets

assassins.bash

#!/usr/bin/env bash
# unnoficial strict mode, note Bash<=4.3 chokes on empty arrays with set -u
# http://redsymbol.net/articles/unofficial-bash-strict-mode/
# https://sharats.me/posts/shell-script-best-practices/
set -o errexit
set -o nounset
set -o pipefail

IFS=$'\n\t'
shopt -s nullglob globstar

[[ "TRACE" == "1" ]] && set -o xtrace

usage() {
  echo 'usage: ./assassins.sh

takes a list of people on stdin and generates files with assassin targets'
  exit
}

[[ "${1:-}" =~ ^-*h(elp)?$ ]] && usage

cd "$(dirname "$0")"

main() {
  mapfile -t people
  people_shuf=( $(shuf -e "${people[@]}") )
  num_people="${#people_shuf[@]}"
  people_looped=( "${people_shuf[@]}" "${people_shuf[0]}" )
  for (( i = 0; i < "$num_people"; i++ )); do
    person=$"${people_looped[$i]}"
    target=$"${people_looped[$((i + 1))]}"
    echo "$target" > "${person}.txt"
  done
}

main "$@"

# never end a file with a short-curcuit!