A little demo for the usage of ‘expect’ in shell.
Normally, distributed system always contain certain nodes, we come across such a situation that each node owns a same user we call it ‘pop’, we use this script to change password of user ‘pop’.
copy the whole folder to one of the nodes and install expect
use ‘admin’ user run “run.sh”
sh run.sh 2>&1 | tee passwd.log( you can also use root as you like, just change the script ) .