Shell Programming and Scripting

a/b/c/d
e/f/g/h
i/j/k/l
m/n/o/p

i/j/k/l

a/b/c/d
e/f/g/h
i/j/k/l "MATCH"
m/n/o/p

for i in `cat FILEB`
do
  if [ `grep "$i" FILEA ]; then
    `sed '/$i/ s/$/ "MATCH" FILEA`
  fi
done

awk 'NR==FNR{a[$0];next}$0 in a{$0=$0 " MATCH"}1' FILEB FILEA > NEWFILEA

# awk 'NR==FNR{a[x++]=$0}END{for(i=0;i<x;i++)if($0==a[i])print a[i]FS"\"MATCH\"";else print a[i]}' FILEA FILEB
a/b/c/d
e/f/g/h
i/j/k/l "MATCH"
m/n/o/p

 awk 'NR==FNR{a[$0]++;next} a[$0]{$0=$0 FS "\"MATCH\""}1' FileB FileA

awk 'NR==FNR{A[$0]="\"MATCH\""; next}{print $0,A[$0]}' FileB FileA

/usr/xpg4/bin/awk  'NR==FNR{A[$0]="\"MATCH\""; next}{print $0,A[$0]}' FileB FileA