Purpose of "read" and "$END$" in ksh ? Post: 302535675

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LEARN ABOUT CENTOS

btrfs-image

BTRFS-IMAGE(8)						      System Manager's Manual						    BTRFS-IMAGE(8)

NAME

       btrfs-image - create/restore an image of the filesystem

SYNOPSIS

       btrfs-image [options] source target

DESCRIPTION

       btrfs-image  is	used to create an image of a btrfs filesystem. All data will be zeroed, but metadata and the like is preserved.  source is
       the special file corresponding to the device containing a btrfs filesystem.  (e.g /dev/sdXX).  target is the image  file  that  btrfs-image
       creates. When used with -r option, btrfs-image restores the image file from source into target.

OPTIONS

       -r     restore metadump image.

       -c value
	      compression level (0 ~ 9).

       -t value
	      number of threads (1 ~ 32) to be used to process the image dump or restore.

       -o     use the old restore method, this does not fixup the chunk tree so the restored file system will not be able to be mounted.

       -s     Sanitize the file names when generating the image. One -s means just generate random garbage, which means that the directory indexes
	      won't match up since the hashes won't match with the garbage filenames. Using -ss will calculate a collision  for  the  filename	so
	      that  the  hashes match, and if it can't calculate a collision then it will just generate garbage.  The collision calculator is very
	      time and CPU intensive so only use it if you are having problems with your file system tree and need to have it mostly working.

       -w     Walk all the trees manually and copy any blocks that are referenced. Use this option if your extent tree is corrupted to	make  sure
	      that all of the metadata is captured.

AVAILABILITY

       btrfs-image  is	part of btrfs-progs. Btrfs is currently under heavy development, and not suitable for any uses other than benchmarking and
       review.	Please refer to the btrfs wiki http://btrfs.wiki.kernel.org for further details.

SEE ALSO

       btrfsck(8),mkfs.btrfs(8)

																    BTRFS-IMAGE(8)