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

[Wojciech Puchar]

>> 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
>
>
for sure you used ' instead of `