refactor to bash script

Author: evanx

README.md

@@ -171,12 +171,12 @@ When we have a large number of matching keys, and are performing a `type` check
 
 The defaults themselves are set in the script, and overridden, as follows:
 ```shell
-  local eachLimit=${eachLimit-1000} # limit of keys to scan, pass 0 to disable
-  local scanSleep=${scanSleep-.250} # sleep 250ms between each scan
-  local eachCommandSleep=${eachCommandSleep-.025} # sleep 25ms between each command
-  local loadavgLimit=${loadavgLimit-1} # sleep while local loadavg above this threshold
-  local loadavgKey=${loadavgKey-''} # ascertain loadavg from Redis key on target instance
-  local uptimeRemote=${uptimeRemote-''} # ascertain loadavg via ssh to remote Redis host
+  eachLimit=${eachLimit-1000} # limit of keys to scan, pass 0 to disable
+  scanSleep=${scanSleep-0.250} # sleep 250ms between each scan
+  eachCommandSleep=${eachCommandSleep-0.025} # sleep 25ms between each command
+  loadavgLimit=${loadavgLimit-1} # sleep while local loadavg above this threshold
+  loadavgKey=${loadavgKey-} # ascertain loadavg from Redis key on target instance
+  uptimeRemote=${uptimeRemote-} # ascertain loadavg via ssh to remote Redis host
 ```
 
 So the defaults can be overridden via the command-line passing, or via shell `export`