Bar

bar is an archive format used for backing up and restoring files in the SunOS operating system, in version 4. Such archives were designed to be sent to tape storage, similarly to tar. For later versions it's advised to "Use tar or cpio -H bar to replace bar".

Links

 * Man page
 * Using File System Administration Commands
 * Google book page referencing the format
 * Newsgroup discussion: Help with Solaris cpio -H bar compatability option for old bar written tapes