Randomly shuffling lines in Linux / Bash

Question

I have some files in linux. For example 2 and i need shuffling the files in one file.

For example

$cat file1
line 1
line 2
line 3
line 4
line 5
line          


        

Answer 1

I would use shuf too.

another option, gnu sort has:

   -R, --random-sort
          sort by random hash of keys

you could try:

cat file1 file2|sort -R