12. sort
The sort command is useful for sorting lines.
file1.txt
dog
cow
cat
elephant
bird$ sort file1.txt
bird
cat
cow
dog
elephant
You can also do a reverse sort:
$ sort -r file1.txt
elephant
dog
cow
cat
bird
And also sort via numerical value:
$ sort -n file1.txt
bird
cat
cow
elephant
dog
Exercises
The real power of sort comes with its ability to be combined with other commands, try the following command and see what happens?
$ ls /etc | sort -rn