wget ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/lsof.tar.bz2
tar xjf lsof.tar.bz2
cd lsof_4.77
wget ftp://lsof.itap.purdue.edu/pub/Victor_A_Abell.gpg
gpg --import Victor_A_Abell.gpg
gpg --verify lsof_4.77_src.tar.sig lsof_4.77_src.tar
tar xf lsof_4.77_src.tar
cd lsof_4.77_src
./Configure linux
make -s
./lsof -v