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 6 line 7 line 8 

and

$cat file2 linea one linea two linea three linea four linea five linea six linea seven linea eight 

And later that i shuffling the two files i can obtain something like:

linea eight line 4 linea five line 1 linea three line 8 linea seven line 5 linea two linea one line 2 linea four line 7 linea six line 1 line 6 

Answer 1

You should use shuf command =)

cat file1 file2 | shuf 

Or with Perl :

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

Answer 2

Sort: (similar lines will be put together)

cat file1 file2 | sort -R 

Shuf:

cat file1 file2 | shuf 

Perl:

cat file1 file2 | perl -MList::Util=shuffle -e 'print shuffle<STDIN>' 

BASH:

cat file1 file2 | while IFS= read -r line do     printf "%06d %s\n" $RANDOM "$line" done | sort -n | cut -c8- 

Awk:

cat file1 file2 | awk 'BEGIN{srand()}{printf "%06d %s\n", rand()*1000000, $0;}' | sort -n | cut -c8-