Shell Programming and Scripting

echo user:test | chpasswd

ipaddr1 password1 user1
ipaddr2 password2 user2
ipaddr3 password3 user3

#!/bin/bash

mapfile addr < ${1}
mapfile pass < ${2}
mapfile user < ${3}

for((i=0; i<${#addr[@]}; ++i)); do
     ssh ${addr[i]} "echo '${pass[i]}' | passwd --stdin '${user[i]}'"
done

bash change_passwd.sh ipaddr.txt password.txt user.txt

./pwd.sh: line 3: mapfile: command not found
./pwd.sh: line 4: mapfile: command not found
./pwd.sh: line 5: mapfile: command not found