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One Day One Command
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chattr — Change File Attributes on a Ext2 File System.

Summary:

Ext2 File System(FS) is providing few extra bit to set some special
attribute to each file in the FS. ‘chattr’ command is used to changes
the file’s special attributes on a Ext2 FS.

Examples:

$ chattr +A myFile — Don’t change the Access time of this file.

$ chattr -V +A myFile — Same as above. But show verbose output.

$ chattr +c myFile — Save the file in compressed mode.

# chattr +i myFile — Make the file as Read-Only.

$ chattr +s myFile — Mark the file as secrete. During deletion its

                     blocks are Zeroed.

$ chattr +u myFile — Mark for undeletion. If this file is deleted,

                     user can ask for undelete.

$ chattr +S myFile — The changes in the file are written

                     synchronously on the disk.

# chattr -i myFile — Remove the Read-Only Mark.

$ chattr =Ac myFile — Set only A & c bit. Clear all other bits.

Read: man chattr