sort
$ cat examples/intro/names.txt
Foo 11
Bar 2
Moo 1
$ sort examples/intro/names.txt
Bar 2
Foo 11
Moo 1
$ sort -k2 examples/intro/names.txt
Moo 1
Foo 11
Bar 2
$ sort -k2 -n examples/intro/names.txt
Moo 1
Bar 2
Foo 11
-k -select field to use for sorting -n -numerical sorting