I have a crontab job in my sun solaris server and basically i have a unix script in 3 different parts

1 part will do an auto ftp from a server

2 part will have some grep and awk related commands and generate certain files

3 part the files that are generated above will be auto ftpied again to the source server.

when i put above 3 parts in crontab using && also the 2nd and 3rd part is not executing properly and even if merge all the above 3 tasks in one crontab also it is not executing.

what is the best way to execute and automate the scripts.

One simple thing would be create a new script and from inside the new script invoke the script 1,script 2 and script 3.
Add the new script to crontab entry.

Or
in crontab try with below format
* * * * * script1;script2;script3