How to find and delete duplicate files within the same directory?

I want to find duplicate files, within a directory, and then delete all but one, to reclaim space. How do I achieve this using a shell script? For example: pwd folder Files in it are: log.bkp log extract.bkp extract I need to compare log.bkp with all the other files and if a duplicate file is found (by it's content), I need to delete it. Similarly, file 'log' has to be checked with all other files, that follow, and so on. So far, I have written this, But it's not giving desired result. #!/usr/bin/env ksh count=ls -ltrh /folder | grep '^-'|wc -l for i in /folder/* do for (( j=i+1; j<=count; j++ )) do echo "Current two files are $i and $j" sdiff -s $i $j if [ echo $? -eq 0 ] then echo "Contents of $i and $j are same" fi done done