11/3/71	CHECK (I)
NAME	check -- file system consistency check
SYNOPSIS	check [ filesystem [[ blockno1 ... ] ]
DESCRIPTION	check will examine a file system, build a bit map of usedblocks, and compare this bit map against the bit map
	maintained on the file system. If the file system is notspecified, a check of both /dev/rf0 and /dev/rk0 is performed. Output includes the number of files on the filesystem, the number of these that are `large', the number of used blocks, and the number of free blocks.
FILES	/dev/rf0, /dev/rk0
SEE_ALSO	find
DIAGNOSTICS	Diagnostics are produced for blocks missing, duplicated, andbad block addresses. Diagnostics are also produced for block
	numbers passed as parameters. In each case, the blocknumber, i--number, and block class (i = inode, x indirect, f free) is printed.
BUGS	The checking process is two pass in nature. If checking isdone on an active file system, extraneous diagnostics may
	occur. The swap space on the RF file system is not accounted forand will therefore show up as `missing'.
OWNER	ken, dmr