How to know when FTP of incoming file is complete

Dear all,
i would like to know when the FTP is complete on my server of an incoming file from another machine.
and as soon as the FTP is complete i want to start the SQLLDR for that file automatically.
i am using Redhat linux enterprise linux server release 5.5 with Oracle 11gR2 RAC.
i have already made the SQLLDR script for the file uploading. however at this time i can only manually run the script or schedule it using cronjob. but with cronjob i cannot know if the FTP has completed or not.
many thanks .

Who is initiating the ftp task? Why not creating a checksum file using "cksum" or "md5" command and include it in the ftp transfer. Then verify the checksum of the uploaded file before performing the SQL Loader process.
Sounds like a job for the DBMS_SCHEDULER or SQL Loader preprocessor feature.
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How to know when FTP of incoming file is complete

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