bash script which can ssh to a remote machine and execute commands, throws error when password is incorrect

Question

I'm trying a bash script where i'm taking an argument of a file which has the IP address. I'm using sshpass, but with this i'm not able to know if ssh login was successful or not. Is there a way to check this ? Please suggest if not sshpass, do i need to use any other cmd, to do remote login and execute cmds ?

Here is the snippet of the code :

#!/bin/bash

filename="$1"
while read -r line; do
  sshpass -p 'test' ssh -o StrictHostKeyChecking=no test@$line 'df -h'
done < "$filename"

Have tried the suggested way to check $? value (if its incorrect password, $? value will be 5, however with valid or invalid password, shell script is not echoing 'wrong password', its always echoing "Can ssh to box- Password is correct" as per the following code :

#!/bin/bash

filename="$1"
while read -r line; do
  sshpass -p 'test' ssh -o StrictHostKeyChecking=no test@$line 'df -h'
  if [ $? -eq 5]
  then
     echo "Wrong password"
  else
    echo "Can ssh to box- Password is correct"
  fi
done < "$filename"

My Requirement is to ssh to the remote box and execute commands. And in case, ssh fails i.e password is invalid, it need to print that password is invalid.

Answer 1

Use return value from sshpass.

According to man sshpass:

RETURN VALUES

As with any other program, sshpass returns 0 on success. In case of failure, the following return codes are used: 5 Invalid/incorrect password

After running sshpass, in bash return value from command is stored in $? variable.

Proof:

devilan@localhost:~ $ sshpass -p 'test' ssh smurf@localhost
devilan@localhost:~ $ echo $?
5

Sugested usage:

sshpass -p 'test' ssh smurf@localhost
if [ $? -eq 5 ]
then
    echo "Wrong password"
else
    echo "Something else"
fi