We have a module that securely transfers files to an external vendor using Perl Script ( EXPECT Module) .. It appears like this code has been copied from an example that is available in one of the perl online tutorials. For FTP Authentication Failure, I would like to trap the error and throw an exception.. However, the process seems to be not throwing an error (in other words, I am not able to identify how to trap the error) .. Code Snippet attached below.

# If sftp is not in your path replace with absolute path of sftp progr
+am
my $COMMAND = 'sftp';
my $FTP_PARAMS = ("$SFTP_USER\@$SFTP_ADDRESS");
 
# Create the Expect object
my $exp = Expect->spawn($COMMAND, $FTP_PARAMS) or die "Cannot spawn sf
+tp command \n";
 
# If this is the first time you are running this , expect will send "y
+es" to add the key
# for the sftp server to the ~/.ssh/known_hosts file else
# wait for "Password Authentication" string to show up
$exp->expect($TIMEOUT,
    ["Password Authentication"],
    ["Are you sure you want to continue connecting", sub {my $self = s
+hift; $self->send("yes\n");}]
    );
 
# Wait for Password prompt to show up 
$exp->expect($TIMEOUT, ["Password:"]);
 
# Sent the sftp password 
$exp->send("$SFTP_PASSWORD\n");
 
# Wait for sftp prompt
$exp->expect($TIMEOUT, ["sftp>"]);
 
if (lc($FUNCTION) eq "get" )
{
 # Get yesterday's report file/s and put it in reportsPath directory o
+n the local machine
 $exp->send("get $FILE_NAME $WORKING_DIRECTORY\n");
}
else
 {
  # Get yesterday's report file/s and put it in reportsPath directory 
+on the local machine
  $exp->send("put $FILE_NAME $WORKING_DIRECTORY\n");
 }
 
# Wait for sftp prompt
$exp->expect($TIMEOUT, ["sftp>"]);
 
# Close ftp session
$exp->send("bye\n");
 
# Destroy the expect object
$exp->soft_close();

}
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