-.TP 6
-.BR \-s \fIX
-Ignore the actual free list and (unconditionally) reconstruct a new
-one by rewriting the super-block of the file system.
-The file system should be unmounted while this is done; if this
-is not possible, care should be taken that the system is quiescent
-and that it is rebooted immediately afterwards.
-This precaution is necessary so that the old, bad, in-core copy
-of the superblock will not continue to be used, or written on the file system.
-.IP
-The
-.BR \-s \fIX
-option allows for creating an optimal free-list organization.
-The following forms of
-.I X
-are supported for the following devices:
-.sp
-.nf
- \-s3 (RP03)
- \-s4 (RP04, RP05, RP06)
- \-sBlocks-per-cylinder\fB:\fRBlocks-to-skip (for anything else)
-.fi
-.IP "" 6
-If
-.I X
-is not given,
-the values used when the filesystem was created
-are used.
-If these values were not specified, then the value
-.I 400:9
-is used.
-.TP 6
-.BR \-S \fIX
-Conditionally reconstruct the free list. This option
-is like
-.BR \-s \fIX
-above except that the free list is rebuilt only
-if there were no discrepancies discovered in the
-file system. Using
-.B \-S
-will force a no response to all questions asked
-by
-.I fsck.
-This option is useful for forcing free list reorganization
-on uncontaminated file systems.
-.TP 6
-.B \-t
-If
-.I fsck
-cannot obtain enough memory to keep its tables,
-it uses a scratch file. If the \f3\-t\fP option is
-specified, the file named in the next argument
-is used as the scratch file, if needed. Without the
-.BR "\-t " flag,
-.I fsck
-will prompt the operator for the name of the
-scratch file. The file chosen should not be on the
-filesystem being checked, and if it is not
-a special file or did not already exist, it is
-removed when
-.I fsck
-completes.