====== BASH - Commands - tac ======

tac - concatenate or print in reverse (last line first).

<code bash>
tac > f1
</code>

1
2
Press CTRL+D to stop


<code bash>
tac f1
</code>

1
2

<code bash>
tac vid.avi > vid2.avi ; mv vid2.avi vid.avi
</code>

It wont play.

<code bash>
tac vid.avi > vid2.avi ; mv vid2.avi vid.avi
</code>

Back to playable. 

NOTE: This is like a mini encryption for binary files.