Shell Programming and Scripting

Hi Friends,
I have two scripts,
i) the mainscript (target.ksh)
ii) and the other script to FTP a file from unix server to Mainframe (ftp_script.ksh)
The process is automated. so initially we have to start the mainscript which at one point generates a file which needs to be FTPed. so we have to call the FTP job in the mainscript.
If an error occurs while transferring the file, we have to come out from both the scripts by sending an email. The support person fixs the problem and will restart from FTP script.
Once the file is transfered successfully, we have to come out of the FTP script completely by calling the mainscript.
target.ksh

Code:

while [ 1 ]
do
   #some code here
       if [$num=0] then
           cd /home/ip/
           ./ftp_script.ksh
       elif
           #some code here
       if
   #some code here
sleep 10;
done

and your question is ?

Sorry i missed my other part of the question in hurry.

target.ksh is the mainscript which is calling ftp_script.ksh.

ftp_script.ksh
result=`ftp -v <<**
open $machine
put file.txt $destination/file1.dat
bye
**`
value=`echo "$result" |grep "226 Transfer complete" |wc -l`

if[$value=1]
then echo "\nFTP Sucess"
## so here, we have to come out of this script completely and have to go back to target.ksh script. so the target.ksh would start as a fresh start
else
echo "\nFTP Failure"
mailx......
## here, we have to come out of both the main target.ksh and this ftp_script.ksh script
fi

Any help is greatly appreciated.
Thank you