Reading file and exclude in ksh

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# 1  
Old 02-06-2014
Reading file and exclude in ksh

I have a text file containing some file names. And I've a directory containing files with different name. I want to do some operaration (deleting) on the files which are NOT listed on the text file.
Im using KSH.

Urgent Help!!!!!
# 2  
Old 02-06-2014
ls /directory > all_files.txt
grep -vf no_delete.txt all_files.txt
execute the above to check
grep -vf no_delete.txt all_files.txt | xargs rm -f
execute the above to remove
# 3  
Old 02-06-2014
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