How to respond to password prompt when using SCP in a shell script?

Question

First of all, I am well aware of that there are many of questions regarding this topic. I have read them, but still could figure out an appropriate answer for my situation.<

Answer 1

I found no way to do this on our systems automatically - I ssh into one device, and then ssh to the next device, and on both, I cannot install any other software. So I can only use existing shell script commands. I can either copy all the files of a type with, such as *.png, or one by one in my script file, having to enter the password for each individual file. The one thing I did that was helpful was to type the password into a file, cut it, and be able to paste it to each prompt for each file.