The sort command sorts things.  Suppose you had a file named alpha.txt that
contained the letters of the alphabet on the left margin, but scrambled.


A
J
M
B
X
W
...

Then the command:

	sort alpha.txt

would produce:

A
B
C
D
E
F
...

on the screen.  Sorting the file reversed by the command:

	sort -r alpha.txt

would reverse the alphabetic order of the lines, giving:

Z
Y
X
W
V
U

The sort command has many options.