man 1 passwd

--stdin
          This option is used to indicate that passwd should read the new
          password from standard input, which can be a pipe.

adduser "$1"
echo "$2" | passwd "$1" --stdin

#!/usr/bin/perl -w
open my $pipe, '|chpasswd' or die "can't open pipe: $!";
print {$pipe} "$username:$password";
close $pipe

echo -e "new_passwordnnew_password" | (passwd user)

echo "password:name" | chpasswd

echo "user:password" | chpasswd

echo $mypassword | passwd --stdin # Eternal Sin.
echo "$mypassword" | passwd --stdin # Eternal Sin, but at least you remembered to quote your PE.
passwd --stdin <<< "$mypassword" # A little less insecure, still pretty insecure, though.
passwd --stdin < "passwordfile" # With a password file that was created with a secure `umask(1)`, a little bit secure.

user="$1"
password="$2"
adduser $user
echo $password | passwd --stdin $user

sshpass -p 'userpass' ssh -T -p port user@server << EOSSH
sudo -S su - << RROOT
userpass
echo ""
echo "*** Got Root ***"
echo ""
#[root commands go here]
useradd -m newuser
echo "newuser:newpass" | chpasswd
RROOT
EOSSH

SMP007-1
SMP007-2
SMP007-3

#set a password across all nodes
printf "User ID: "
read MYUSERID
printf "New Password: "
read MYPASS

while read -r i; do
    echo changing password on "$i"
    ssh root@"$i" sudo echo "$MYUSERID":"$MYPASS" | chpasswd
    echo password changed on "$i"
done< /usr/bin/setpwd.srvrs

tr -dc A-Za-z0-9 < /dev/urandom | head -c44 | passwd --stdin $user