>> пока думаю заюзать find
>

 
> dir=/path/to/target 
> find $dir -type f  -mtime +30  ! \( -name "*-0*-01.*.tar.bz2" 
> -o -name "*-0*-15.*.tar.bz2" \)  -delete 
> find $dir -type f  -mtime +180 !    -name 
> "*-0*-01.*.tar.bz2" -delete 
> 

-delete не заработала, несмотря на:

     -delete
             Delete found files and/or directories.  Always returns true.
             This executes from the current working directory as find recurses
             down the tree.  It will not attempt to delete a filename with a
             ``/'' character in its pathname relative to ``.'' for security
             reasons.  Depth-first traversal processing is implied by this
             option.  Following symlinks is incompatible with this option.

Пришлось, через " -exec rm -rf {} \;" удалять

dir=/path/to/target
find $dir -type f  -mtime +30  ! \( -name "*-0*-01.*.tar.bz2" -o -name "*-0*-15.*.tar.bz2" \)  -exec rm -rf {} \;
find $dir -type f  -mtime +180 !    -name "*-0*-01.*.tar.bz2" -exec rm -rf {} \;