Random numbers generation with awk in BASH shell

Question

I wish to shuffle the lines (the rows) of a file at random then print out to different five files.

But I keep having exactly the same order of lines appeared in file

Answer 1

Awk's pseudo-random is not very random, you need to keep seeding, you should be able to use microseconds for most situations, otherwise you may want to look into Bash ${RANDOM} or hitting /dev/urandom direct:

awk 'BEGIN{"date +%N"|getline rseed;srand(rseed);close("date +%N");print rand()}'

for((i=1;i<=5;i++));do awk 'BEGIN{"date +%N"|getline rseed;srand(rseed);close("date +%N");print rand()}';done