ISNI
wget http://viaf.org/viaf/data/viaf-20170906-links.txt.gz
make smaller
gunzip < viaf-20170906-links.txt.gz | bzip2 > viaf-20170906-links.txt.bz2
extract uncompressed file (keep original compressed file)
gunzip -c viaf-20170906-links.txt.gz > viaf-20170906-links.txt
see sizes
ls -la -rw-r--r-- 1 root root 4440512262 Sep 21 11:44 viaf-20170906-links.txt -rw-r--r-- 1 root root 666148170 Sep 21 11:28 viaf-20170906-links.txt.bz2 -rw-r--r-- 1 root root 814025893 Sep 7 10:36 viaf-20170906-links.txt.gz