Gipi, a console based jumble like puzzle game is developed by
Mr Dinker Charak. URL: http://sarovar.org/projects/gipi/

One Day One Command
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fsck — Linux File System Check and Repair Tool.

Summary:

‘fsck’ is used to check and optionally repair one or more Linux file
systems. If no file-systems are specified on the command line, fsck
will default to checking file-systems in /etc/fstab file.

In actuality, fsck is simply a front-end for the various file system
checkers (fsck.cramfs, fsck.ext2, fsck.ext3, fsck.jfs, fsck.msdos,
fsck.reiserfs, fsck.vfat, …) available under GNU/Linux OS.

Examples:

# fsck — Check all file systems available in /etc/fstab.

$ fsck -N — Don’t execute. Just show what would be done.

# fsck -V — Show detailed output, including all file system-specific

? ? ? ? ? ? commands that are executed.

# fsck -a — Automatically repair the file system without asking for

? ? ? ? ? ? confirmations. (By default, ask for conformation).

# fsck /dev/hda2 — Check the HDA2 device/partition.

# fsck /usr/local — Check the /usr/local mount point.

# fsck LABEL=usr — Check file-system, which has a label matching

? ? ? ? ? ? ? ? ? ?to “usr”.

Read: man fsck