<h3 id="heading-the-default-function-of-sort-command-and-the-r-or-reverse-option">The default function of sort command and the -r or --reverse option</h3>
<pre><code>nuclearegg69@zenbook-f13:~$ cat unsorted.txt
white apple
yellow orange
black banana
hannah montana
cheetah in the savanna
nuclearegg69@zenbook-f13:~$ sort unsorted.txt
black banana
cheetah in the savanna
hannah montana
white apple
yellow orange
nuclearegg69@zenbook-f13:~$ sort -r unsorted.txt
yellow orange
white apple
hannah montana
cheetah in the savanna
black banana
</code></pre><h3 id="heading-u-option-or-unique-prints-only-unique-lines-while-sorting">-u option or --unique prints only unique lines while sorting</h3>
<pre><code>nuclearegg69@zenbook-f13:~$ nano unsorted.txt
nuclearegg69@zenbook-f13:~$ cat unsorted.txt
white apple
white apple
yellow orange
yellow orange
black banana
hannah montana
cheetah in the savanna
nuclearegg69@zenbook-f13:~$ sort -u unsorted.txt
black banana
cheetah in the savanna
hannah montana
white apple
yellow orange
</code></pre><h3 id="heading-sorting-numbers">Sorting numbers</h3>
<pre><code>nuclearegg69@zenbook-f13:~$ cat unsortedNums.txt
1
2
188
9
78
nuclearegg69@zenbook-f13:~$ sort unsortedNums.txt
1
188
2
78
9
nuclearegg69@zenbook-f13:~$ sort -n unsortedNums.txt
1
2
9
78
188
</code></pre>The sort command by default doesnt work for numbers because it compares character by character so first number in 188 is 'more up in the list of numbers' than 2 so 188 goes first, so we have to use -n or --numeric-sort for it work as we would expect.

### The default function of sort command and the -r or --reverse option

```
nuclearegg69@zenbook-f13:~$ cat unsorted.txt
white apple
yellow orange
black banana
hannah montana
cheetah in the savanna
nuclearegg69@zenbook-f13:~$ sort unsorted.txt
black banana
cheetah in the savanna
hannah montana
white apple
yellow orange
nuclearegg69@zenbook-f13:~$ sort -r unsorted.txt
yellow orange
white apple
hannah montana
cheetah in the savanna
black banana
```

### -u option or --unique prints only unique lines while sorting


```
nuclearegg69@zenbook-f13:~$ nano unsorted.txt
nuclearegg69@zenbook-f13:~$ cat unsorted.txt
white apple
white apple
yellow orange
yellow orange
black banana
hannah montana
cheetah in the savanna
nuclearegg69@zenbook-f13:~$ sort -u unsorted.txt
black banana
cheetah in the savanna
hannah montana
white apple
yellow orange
```

### Sorting numbers 

```
nuclearegg69@zenbook-f13:~$ cat unsortedNums.txt
1
2
188
9
78
nuclearegg69@zenbook-f13:~$ sort unsortedNums.txt
1
188
2
78
9
nuclearegg69@zenbook-f13:~$ sort -n unsortedNums.txt
1
2
9
78
188
```

The sort command by default doesnt work for numbers because it compares character by character so first number in 188 is 'more up in the list of numbers' than 2 so 188 goes first, so we have to use -n or --numeric-sort for it work as we would expect.