cd ~/Downloads
wget http://www.jsoftware.com/download/j903/install/j903_linux64.tar.gz
tar xzf j903_linux64.tar.gz -C ~/

##</code><code>##

$ diff llil.ijs llil2.ijs 
50c50
< text =: , words ,. TAB ,. (nums ,. CR) ,. LF
---
> text =: , words ,. TAB ,. nums ,. LF
64,65d63
< echo 'Finished. Waiting for a key...'
< stdin ''

##</code><code>##

$ ~/j903/bin/jconsole llil2.ijs big1.txt big2.txt big3.txt out.txt
Read and parse input:    0.850145
Classify, sum, sort:     2.08596
Format and write output: 1.24986
Total time:              4.18597

##</code><code>##

# Update J engine to AVX or AVX2, depending on the CPU.

$ ~/j903/updateje.sh 
Engine: j903/j64avx2/linux
Release-b: commercial/2022-01-28T04:13:29
Library: 9.03.08
Platform: Linux 64
Installer: J903 install
InstallPath: /home/mario/j903
Contact: www.jsoftware.com

$ ~/j903/bin/jconsole llil2.ijs big1.txt big2.txt big3.txt out.txt
Read and parse input:    0.789199
Classify, sum, sort:     1.56741
Format and write output: 1.12442
Total time:              3.48103