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If you're going to use two greps, with the fixed strings needed for this project, grep -F (or fgrep) will be faster than egrep (or grep -E). I.e., try:
grep -F ' setting application ' file1.txt |...

Not too far off. Tryfor i in ${arr[@]}
do if [ $a -le $i ]
then echo "$i"
fi
done
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Make sure there's spaces around the square brackets, and use...

Is it just one line? Or the pattern is unique?

UID="admin"
PWD="password"

sed 's/^<UID.*PWD.*/UID = '\"$UID\"' PWD = '\"$PWD\"'>/' file

According to the standards, ls -t|tail -n 10 should give you the 10 newest files. And, ls -tr|tail -n 10 should give you the 10 oldest files.

However, on some systems, ls -t gives you...