Modify user passwords in batches in Linux system

Purpose of the script: Modify Linux system user passwords in batches

Conditions: The modified user must be root, because only root has the permission to use the passwd command

Instructions: First write the IP, user, password, and port information to the old_info file , the script reads the corresponding information from this file and uses expect to log in to the system without interaction. Change the randomly generated 8-digit password to the new password of the root user. Then save the new password to the net_info file.

# cat old_info

# ip ip user passwd port

#-------------------------------- ---------------

192.168.18.217 root n8wX3mU% 22

192.168.18.218 root c87;ZnnL 22

# cat change_pass.sh

#!/bin/ bash

OLD_INFO=~/old_info

NEW_INFO=~/new_info

for IP in `awk '/^[^#]/{print $1}' $OLD_INFO`; do

  USER=`awk -v I=$IP'{if(I==$1)print $2}' $OLD_INFO`

PASS=`awk -v I=$IP'{if(I==$1)print $3}' $OLD_INFO`

PORT=`awk -v I=$IP'{if(I==$1)print $4}' $OLD_INFO`

NEW_PASS=`mkpasswd -l 8`

echo "$IP $USER $NEW_PASS $PORT"> ;> $NEW_INFO

expect -c "

spawn ssh -p$PORT $USER@$IP

set timeout 2

expect {

"(yes/no)"{send "yesr";exp_continue}

"password:"{send "$PASSr";exp_continue}

"$USER@*"{send "echo '$NEW_PASS' |passwd --stdin $USERrexitr";exp_continue}

"$USER@* " {send"df -hr exitr";exp_continue}

}"

done

# cat new_info

192.168.18.217 root n8wX3mU% 22

19 2.168.18.218 root c87;ZnnL 22

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