Use only with -i . No files are created, read, or copied. Restoring device files from previous versions of the OS, or from different systems can be very dangerous. A Suppress warning messages regarding optional access control list entries. Normally, a warning message is printed for each file that has optional access control list entries.
C Have cpio checkpoint itself at the start of each volume.
If cpio is writing to a streaming tape drive with immediate-report mode enabled and a write error occurs, it normally aborts and exits with return code 2 . With this option specified, cpio instead automatically restarts itself from the checkpoint and rewrites the current volume. Alternatively, if cpio is not writing to such a device and a write error occurs, cpio normally continues with the next volume. With this option specified, however, the user can choose to either ignore the error or rewrite the current volume. Use only with -i .