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

You should use shuf command =)

cat file1 file2 | shuf

Or with Perl :

cat file1 file2 | perl -MList::Util=shuffle -wne 'print shuffle <>;'