Gerty ~/Videos/YouTube > wc -l index.txt
1333 index.txt
Gerty ~/Videos/YouTube > time cat index.txt > /dev/null

real	0m0,001s
user	0m0,000s
sys	0m0,000s
Gerty ~/Videos/YouTube > time while read l; do echo "$l"; done < index.txt > /dev/null

real	0m0,016s
user	0m0,013s
sys	0m0,003s