What Is in the Archive?
When you have an archive on a removable device, you might not know what is on it. Perhaps you are using a multiple-level backup scheme and you don't know which day the file was backed up. Both tar and cpio offer a way of creating a table of contents for the tape. The most convenient time to create this TOC file, of course, is during the actual backup. The following two lines show how to perform a backup and at the same time create a table of contents file for that archive:
$ tar cvf - / > /tmp/backup.Monday.TOC $ find / -print | cpio -ov > /dev/rmt0 2> /tmp/backup.Monday.TOC
The cpio backup automatically sends the list to standard error; therefore, this line just captures standard error and saves it as a file. By the ...
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