package method

1.Install new package lsof
#pkg_add -r lsof

2.list all package installed
#pkg_info

3.compare package version with port tree
#pkg_version

= version equals port tree
< version older than port tree
> version newer than port tree ( port tree must update)
? no index to confirm version
* too much version had installed

4.remove package have installed
#pkg_info | grep lsot
#pkg_delete lsof-4.82,4