Bash: split line into multiple lines
<p>I have a list of words in lines:</p>

<pre><code>aaaa bbbb ccc dddd
eee fff ggg hhh
iii jjj kkk
</code></pre>

<p>I want each word in a separate line:</p>

<pre><code>aaaa
bbbb
ccc
dddd
eee
fff
ggg
hhh
iii
jjj
kkk
</code></pre>

<p>How to do that in bash with <strong>least number of characters</strong>? Without awk preferably.</p>