CHECK (VIII)                 1/20/73                 CHECK (VIII)

NAME            check -- file system consistency check

SYNOPSIS        check [ filesystem [ blockno  ... ] ]

DESCRIPTION     check will examine a file system, build a bit map

                of used blocks, and compare this bit map against

                the bit map maintained on the file system.  If

                the file system is not specified, a check of all

                of the normally mounted file systems is per-

                formed.  Output includes the number of files on

                the file system, the number of these that are

                'large', the number of indirect blocks, the num-

                ber of used blocks, and the number of free


                check works by examining the i-nodes on the file

                system and is entirely independent of its direc-

                tory hierarchy.  The file system may be, but need

                not be, mounted.

FILES           /dev/rf?, /dev/rk?, /dev/rp?

SEE ALSO        find(I), ds(I)

DIAGNOSTICS     Diagnostics are produced for blocks missing, du-

                plicated, and bad block addresses.  Diagnostics

                are also produced for block numbers passed as pa-

                rameters.  In each case, the block number, i-

                number, and block class (i = inode, x indirect, f

                free) is printed.

BUGS            The checking process is two pass in nature.  If

                checking is done on an active file system, extra-

                neous diagnostics may occur.