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Try

$ cat file1
name1
name2
name3
name4
name5
name6
$ cat file2
name1 group1 good
name3 group2 bad success
name4 group3 good
name6 group4 good success success
name9 group5 good
name10...

awk 'NR==FNR{A[$1]=$2;next}{print $1,A[$1]}' file2 file1

OR

join file1 file2 -a 1

nawk '{r[$2]++;s[$2]+=$1}END{for(i in r) if (r[i]>1) print int(s[i]/r[i]), i}' myFile

cat file1.txt file2.txt | awk '{print $1}' | sort | uniq -u

name4
name5

awk ' FILENAME=="file2.txt" {arr[$1]++}
FILENAME=="file1.txt" {if ($1 in arr) {next} else {print $0} }' file2.txt file1.txt

Note: file2.txt should be the first parameter

awk '{print $NF}' LT_file.txt | grep -f - LU_file.txt

awk '{print $NF}' LT_file.txt | while read a
do
grep $a LU_file.txt && grep $a LT_file.txt
done