tar -j for openbsd

TAR(1)                     OpenBSD Reference Manual                     TAR(1)

NAME
     tar - tape archiver

SYNOPSIS
     tar {crtux}[014578befHhjLmOoPpqsvwXZz]
         [blocking-factor | archive | replstr] [-C directory] [-I file]
         [file ...]
     tar {-crtux} [-014578eHhjLmOoPpqvwXZz] [-b blocking-factor] [-C
         directory] [-f archive] [-I file] [-s replstr] [file ...]

DESCRIPTION
     The tar command creates, adds files to, or extracts files from an archive
     file in ``tar'' format.  A tar archive is often stored on a magnetic
     tape, but can be stored equally well on a floppy, CD-ROM, or in a regular
     disk file.
...

-j      Compress archive using bzip2.  The bzip2 utility must be in-
             stalled separately.
...

已经支持bzip2了。