loops - Adding text before each line in file in linux -


text file has sample.txt

a/b/1 b/f/2 y/z/3 a/y/4 t/q/5

want output 

a/1 a/2 a/3 a/4 a/5

tried code 

dir="a/" num=$(wc -l < sample.txt)  ((i=1; i<=$num; i++));   echo "$dir""`awk -f "/" '{print $nf}' sample.txt`"  echo "$i"  break  done

but gives me output 

a/1 2 3 4 5

issue using awk updating first row. please 

awk -f'/' '{print "a/"$3}' sample.txt

(or)

awk -f'/' '{print "a/"$nf}' sample.txt

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