Cannot use options for echo command

Hi there,

When I used `echo` command in alias function, `-n` option is not used by `echo` as follows:

```
foo =
!f() {
echo -n 1
}; f
```

```
$ aws foo
-n 1
```

But, `ls` command can use options successfully:

```
bar =
!f() {
ls
}; f

baz =
!f() {
ls -l
}; f
```

```
$ aws bar
file1 file2

$ aws baz
total 0
-rw-r--r-- 1 aibou staff 0 3 16 15:20 file1
-rw-r--r-- 1 aibou staff 0 3 16 15:20 file2
```

It seems a bug but I can't understand why ONLY `echo` behave it...

Reproduce the `aws foo` alias from the issue and compare it with `aws bar` and `aws baz`; then trace how the alias function is invoked and how `echo -n 1` is passed. Done means the `foo` alias honors `-n` while the existing `ls` behavior remains unchanged.

Written by the indexing model from the issue text.