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How to read two files simultaneously in linux

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Thursday January 22, 2015
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i have two sorted files of images(ls -l),i have to compare these two files and check each line are same if it same move to next line if not same i have to rechange it to equal.
bt for me not executing properly
my codings are below
while read line
do
while read lline
do
if [ "$line"=="$lline" ]
then
break
else
sudo cp -r /digital_images/local1/00/00_sortedlist.txt/$line /digital_images local1/00/00_localsortedlist.txt/$lline
fi
done </digital_images local1/00/00_localsortedlist.txt
done </digital_images/local1/00/00_sortedlist.txt
Any one pls give me suggestion for this
Thanks in advance
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Wednesday February 25, 2015
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 1
If you want to read two files, then you can use the following command:

# cat file1 file2
If you want to compare two file then, use:
# cmp file1 file2
If you want to check the difference then use:
# diff file1 file2
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