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CPIO(5) File Formats Manual CPIO(5) NAME cpio - format of cpio archive DESCRIPTION The archived files are recorded consecutively, each preceded by a header. The header structure, when the -c option of cpio(1) is not used, is: typdef unsigned short ushort; struct { short h_magic, h_dev; ushort h_ino, h_mode, h_uid, h_gid; short h_nlink, h_rdev, h_mtime[2], h_namesize, h_filesize[2]; char h_name[h_namesize rounded to word]; } Hdr; When the -c option is used, the header information is printable, as de- scribed by the printf(3) call printf(Chdr, "%6o%6o%6o%6o%6o%6o%6o%6o%11lo%6o%11lo%s", Hdr.h_magic, Hdr.h_dev, Hdr.h_ino, Hdr.h_mode, Hdr.h_uid, Hdr.h_gid, Hdr.h_nlink, Hdr.h_rdev, Longtime, Hdr.h_namesize, Longfile, Hdr.h_name and are equivalent to and respectively. Every instance of contains the octal constant The items through have meanings explained in stat(2). The length of the null-terminated path name including the null byte, is given by The last element of the archive is a dummy entry for the name TRAILER!!!, with padding to a multiple of 512 bytes. Special files, directories, and the trailer are recorded with equal to zero. SEE ALSO cpio(1), find(1), stat(2). CPIO(5)