Change Solaris user password with Expect script

Changing Linux user password  without user keyboard input  is very easy by  builtin command "chpasswd "or "passwd --stdin".
Solaris doesn't have such commands , the result can be achieved  by Expect script.

#Expect script
$cat chpwd.sh

#!/usr/local/bin/expect --
# Input: username password
set USER [lindex $argv 0]
set PASS [lindex $argv 1] 

if { $USER == "" || $PASS == "" }  {
   puts "Usage:  ./scriptname username password\n"
   exit 1
 }

spawn sudo passwd $USER 
expect "assword:"
send "$PASS\r"
expect "assword:"
send "$PASS\r"
expect eof

#Shell script: Generate a random password and call the Expect script to set it


$cat createpwd.sh

#!/bin/ksh
# Generate a random password  for a user and set the new password 
USER=$1
PASS=`tr -dc [:alnum:] </dev/urandom | fold -8 | head -1`
if [ -z "$USER" ]; then
echo "Usage $0 username"
exit
fi
./chpwd.sh $USER $PASS 
echo "username=$USER"
  
echo "password=$PASS"