help writing a bash script

#!/bin/sh

HOST_LIST_FILE=file.txt
USER_NAME=user
USER_PASSWD=pass
EXIST_FILE=/the/remote/exist/file

LOG_FILE=/log/file

EXCLUDE_PATTERN="exclude /smarty"

function write2log()
{
echo $(date '+%m.%d.%Y-%H:%M:%S'): $*
} >> $LOG_FILE

for hostname in $( awk -F: '{print $1;}'  ${HOSTS_LIST_FILE} ); do
        auto_ssh.exp $USER_NAME  $USER_PASSWD $hostname 0 ls $EXIST_FILE
        if [ $? ne 0 ]; then
                write2log $hostname : $EXIST_FILE [Not exist]
        else
                auto_ssh.exp $USER_NAME  $USER_PASSWD $hostname 1 grep "${EXCLUDE_PATTERN}" $EXIST_FILE
                if [ $? eq 0 ]; then
                        # you can remove the following log msg if it not needed 
                        write2log $hostname : $EXIST_FILE [Exist] - ${EXCLUDE_PATTERN}  [ Already Exist ] - do nothing
                else
                        tf=tempfile
                        auto_ssh.exp $USER_NAME  $USER_PASSWD $hostname 0 cat ${EXIST_FILE} | awk -vexclude_dir_name="${EXCLUDE_PATTERN}" 'BEGIN{ exclude_flag=0 printed=0 } /^exclude/{exclude_flag=1;}  ! /^exclude/ && exclude_flag==1 && printed==0 {printed = 1; printf( "%s\n" ,  exclude_dir_name); } /^include/ && printed==0 { printed=1; printf("%s\n", exclude_dir_name); } {print $0;}' > $tf

                        
                        auto_ssh.exp $USER_NAME  $USER_PASSWD $hostname 2 $tf ${EXIST_FILE}

                        # to be more safe you can use the following instead
                        #cat $tf | auto_ssh.exp $USER_NAME  $USER_PASSWD $hostname 0 cat ${EXIST_FILE}.tmp
                        #auto_ssh.exp $USER_NAME  $USER_PASSWD $hostname 1 rm ${EXIST_FILE}
                        #auto_ssh.exp $USER_NAME  $USER_PASSWD $hostname 2 ${EXIST_FILE}.tmp ${EXIST_FILE}
                        rm $tf
                        write2log $hostname : $EXIST_FILE [Exist] - ${EXCLUDE_PATTERN} [Added]

                fi
        fi
done

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#!/usr/bin/expect -f
# Author: Arnon Kaufman
# based on    http://bash.cyberciti.biz/security/expect-ssh-login-script/
#  ./sshe.exp <user> <password> <ipaddress> <mode>  <remote script/command> <remote command args>
# ------------------------------------------------------------------------
# Copyright (c) Arnon Kaufman
# This script is licensed under GNU GPL version 2.0 or above
# -------------------------------------------------------------------------

set user [lrange $argv 0 0]
set password [lrange $argv 1 1]
set ipaddr [lrange $argv 2 2]
set mode [lrange $argv 3 3]
set remote_command [lrange $argv 4 4]
set args [lrange $argv 5 end]
#set timeout -1


if { $mode eq "1" } {
       spawn ssh $user@$ipaddr $remote_command $args
} else {
       if { $mode eq "0" } {
               spawn ssh $user@$ipaddr $remote_command $args ">/dev/null 2>&1; echo $?"
       } else {
               if { $mode eq "2" } {
                       spawn scp $remote_command $user@$ipaddr:$args
               }
       }
}

match_max 100000
expect "*?assword:*"
send -- "$password\r"
send -- "\r"

if { $mode ne "0" } {
       expect {
               "0" { exit 0; }
               eof { exit 1; }
       }
} else {
       expect eof
}

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