i just start to use Script bash on UNIX and i didnt find a solution to write the first command in the history which start , for example , with ls. If i write in the shell

history !ls

it works but when i'm going to create a script it wont work.

This is my example code

#!/bin/bash
set -o | grep history
set -o history
#echo "HISTFILE is $HISTFILE"
#history "!ls"; 
#history
#!ls
history #it works

Another Question why echo "HISTFILE is $HISTFILE" print me only HISTFILE is ?? Thanks