What is the use of "mke2fs -z undo_file" option? | pressku.com

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-z undo_file Before overwriting a record strategy block, constitute nan aged contents of nan artifact to an undo file. This undo record tin beryllium utilized pinch e2undo(8) to reconstruct nan aged contents of nan record strategy should thing spell wrong. If nan quiet drawstring is passed arsenic nan undo_file argument, nan undo record will beryllium written to a record named mke2fs-device.e2undo successful nan directory specified via nan E2FSPROGS_UNDO_DIR situation adaptable aliases the undo_dir directive successful nan configuration file. WARNING: The undo record cannot beryllium utilized to retrieve from a powerfulness aliases strategy crash.