zip

compress

tar -jcvf *.tar.bz2 folder1/ folder2/

extract

tar xvfj *.tar.bz2

split one file into *.tar.bz2.00, *.tar.bz2.01,...

split -d -b 4G *.tar.bz2 *.tar.bz2.

put back together

cat *.tar.bz2.* > *.tar.bz2