sed to read x.txt and grep from y.txt


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# 1  
sed to read x.txt and grep from y.txt

How would I write a command(s) to read from a file (list) that looks like this: 29847374384 and grep from a second file (list) that looks like this: 29847374384, jkdfkjdf,3833,dddSmilie
# 2  
file1:
Quote:
29847374384
file2:
Quote:
29847374384, jkdfkjdf,3833,ddd
grep -f file1 file2
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