Expect spawn: No such file or directory error - bash

Question

I am writing an Expect script that remotes to a server "server2" and executes fileexists.sh that will find if file exists at a particular location.
Bash script - fileexists.sh is as follows:
#!/bin/bash
if [ -s $1 ]; then
echo "non empty file exists."
else
echo "File doesnot exist or is empty."
Expect script - expec is as follows:
#!/usr/bin/expect
set username [lindex $argv 0]
set password [lindex $argv 1]
set hostname [lindex $argv 2]
set rfile [lindex $argv 3]
set prompt "$username* ~]$ "
spawn ssh -q -o StrictHostKeyChecking=no $username#$hostname
expect {
timeout {
puts "\n\nConnection timed out"
exit 1
}
"*assword:" {
send "$password\r"
}
}
expect {
"$prompt" {
puts "Logged in successfully.
}
}
spawn ./fileexists.sh $rfile
set lineterminationChar "\r"
expect {
$lineterminationChar { append output $expect_out(buffer);exp_continue}
eof { append output $expect_out(buffer)}
}
puts $output
When i call the expect script with ./expec user pass server2 /apps/bin/file.p I get output as "File doesnot exist or is empty." although the file exists at its location on server2.
i checked using expect:
if {[file exists $rfile]} { puts "file exists" }
And output i get is "file exists".
Seems to be something with spawn that I am unable to figure out.

Answer 1

To check on the remote host, do this (I assume you are logging in to a linux machine, or a machine with GNU stat): untested
send -- "stat -c '%s' '$rfile'\r"
expect {
-re {\r\n(\d+)\r\n} {
puts "$rfile exists with size $expect_out(1,string)"
}
-gl {*No such file or directory*} {
puts "$rfile does not exist"
}
}
send "exit\r"
expect eof