# wget http://search.cpan.org/CPAN/authors/id/I/IL/ILYAZ/modules/Math-Pari-2.010709.tar.gz
# gunzip Math-Pari-2.010709.tar.gz
# tar -xf Math-Pari-2.010709.tar   
# cd Math-Pari-2.010709       
# cd pari-2.1.7
bash: cd: pari-2.1.7: No such file or directory