pkg_deinstall: "delete all packages installed, except for X, Y and Z"

[Fbsd1]

Wojciech Puchar wrote:
>> Hello list.
>>
>> I am trying to clean up a system with a LOT of cruft. Is there some
>> argument I could pass to pkg_deinstall that would result in "delete
>> all packages installed, except for X, Y and Z" (and obviously their
>> dependancies)?
> 
> just do
> 
> pkg_info |cut -f 1 -d " " >/tmp/pkglist
> edit pkglist and delete lines X, Y and Z
> 
> do
> 
> pkg_delete `cat /tmp/pkglist`
> rm /tmp/pkglist
> 
> ignore errors about package can't be deleted because X, Y or Z requires 
> it. it's exactly what you want.
> 
> 
pkg_delete `cat /tmp/pkglist`  gives error 'no such package `cat 
/tmp/pkglist` installed