How do I send authentication details in a Bash script?

Question

I want to write a bash script which sends a password to authenticate with a remote server.

For example, I want to write a bash script which would pull the code from a github repository to a server, but I have to specify a password or passpharse to do it.

How am I supposed to code that? I tried couple of things but nothing worked.

5 revs, 2 users 98% · Accepted Answer · 2019-06-19 11:00:10Z

7

I think it was discussed a lot but you could use expect. Here is an example of using it to connect to host using ssh:

#!/usr/bin/expect

set password "YOURPASSWORD"
set user "john"
set host "192.168.1.100"

spawn ssh $user@$host
expect "Password:"
send "$password\n";
interact

Replace "ssh user@host" with your command you want to execute, e. g. "git pull":

spawn git pull

The next line tells which prompt to expect ("Password:"). Make sure this string is set to exactly what appears after you manually do git pull. Case sensitivity and spaces are important.

EDIT: installing expect is easy, on Debian-based systems:

apt -y install expect

on RedHat-based:

yum -y install expect

edited Jun 19, 2019 at 11:00

community wiki

5 revs, 2 users 98%
dimir

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2 Comments

user50049 Over a year ago

Expect is a really nice tool to use, especially if you have commit / pull / etc hooks that prompt for additional input.

SiegeX Over a year ago

autoexpect is another good tool. I like to use that to create the original script, then go in and edit out the parts I think need fixing.

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