dry_run.sh

#!/bin/bash
# Quick Dry Run Example Bash
dry=$1
function run () {
  if [ ! -z "$dry" ]; then
    echo "WOULD HAVE $@"
  else
    $@
  fi
}

run echo hello there
run curl -I google.com
this=$(run curl -I yahoo.com)
run echo $this
run echo $that

# Notes you'll want to avoid trying to set variables with run() as it 
#  doesn't eval and will error out saying "this=that" Command not found