use ssh with password natively without expect/sshpass from non-interactive shell

ssh_wizardry.sh

# in a scenario where you have a non-interactive shell, and need to use discovered SSH credentials (not private keys) from cli and don't 
# want to/can't install expect/sshpass
# usage would be create script on target host, and use the non interactive shell to chmod +x/execute script from target
# if calling with bash need to give full path to script even if operating in same directory
#video at https://www.youtube.com/watch?v=-YlG9M9X2Oc

#!/bin/bash
SSH_USER=testuser
SSH_PASS="password123"
SSH_HOST=127.0.0.1
REMOTE_CMD="ls -al"
if  [ -n "$PASSWORD"  ]; then
cat  <<<  "$PASSWORD"
exit 0
fi
export PASSWORD=$SSH_PASS
export SSH_ASKPASS=$0
export DISPLAY=dummy:0
exec setsid ssh -o "StrictHostKeyChecking no" $SSH_USER@$SSH_HOST $REMOTE_CMD

# from https://titanwolf.org/Network/Articles/Article?AID=ec202919-fb60-49d8-b75f-38025d69e222#gsc.tab=0