<p></p>
<p>Which shell are you using?</p>
<p>Bash defines:</p>
<pre><code>name
A word consisting solely of letters, numbers, and underscores, and beginning with a letter or underscore. Names are used as shell variable and function names. Also referred to as an identifier.
</code></pre>
<p>so <code>.</code> <code>::</code> etc are not valid within shell names.</p>

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