Extracting data out of a huge text file
head -n 532541 big-file > first-bit

awk 'NR<=532541' big > small
awk '{if(NR<=532541) print; else exit}' big > small  #if the file is really huge
sed -n '1,532541p' big > small
sed '1,532541!d' big > small
sed '532542,$d' big > small

sed '532541q' big > small
awk '{print} NR==532541 {exit}' big > small