find files not in a list

Question

I have a list of files in file.lst. Now I want to find all files in a directory dir which are older than 7 days, except those in the file.lst

Answer 1

Pipe the find-command to grep using the -v and -f switches

find -mtime +7 -print | grep -vf file.lst > found.lst

grep options:

-v : invert the match
-f file: - obtains patterns from FILE, one per line

example:

$ ls
a  b  c  d  file.lst

$ cat file.lst 
a$
b$
c$


$ find . | grep -vf file.lst 
.
./file.lst
./d