Crontab job scheduler problem

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http://www.unix.com – Dear All. I have a scripts which does many task like house keeping, moving file to different location and loading the data into oracle. I run this scripts daliy manually , I decided to put it into cron. I have put the scripts into crantab but the behaviour of the scripts have changed. it moves the files as it has been coded but donot call oracle loader to load the data. when running manually it can do all the work as per the code. Any clue please (HowTos)