| clri | special_device inode_number ... | 
clri is obsoleted for normal file
  system repair work by
  
fsck(8).
clri zeros out the inodes with the
    specified inode number(s) on the filesystem residing on the given
    special_device. The
    fsck(8) utility is usually run
    after clri to reclaim the zero'ed inode(s) and the
    blocks previously claimed by those inode(s). Both read and write permission
    are required on the specified special_device.
The primary purpose of this routine is to remove a file which for
    some reason is not being properly handled by
    fsck(8). Once removed, it is
    anticipated that fsck(8) will be
    able to clean up the resulting mess.
The clri utility first appeared in
  Version 6 AT&T UNIX.
If the file is open, the work of clri will be lost when
  the inode is written back to disk from the inode cache.