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    <p>Just a quick note/summary for any who came here via Google looking for the answer to the general question asked in the title (as I was). Any of the following should work for getting access to shell variables inside quotes:</p> <pre><code>echo "$VARIABLE" echo "${VARIABLE}" </code></pre> <p>Use of single quotes is the main issue. According to the <a href="http://www.gnu.org/software/bash/manual/bashref.html#Single-Quotes" rel="noreferrer">Bash Reference Manual</a>:</p> <blockquote> <p>Enclosing characters in single quotes (<code>'</code>) preserves the literal value of each character within the quotes. A single quote may not occur between single quotes, even when preceded by a backslash. [...] Enclosing characters in double quotes (<code>"</code>) preserves the literal value of all characters within the quotes, with the exception of <code>$</code>, <code>`</code>, <code>\</code>, and, when history expansion is enabled, <code>!</code>. The characters <code>$</code> and ` retain their special meaning within double quotes (see Shell Expansions). The backslash retains its special meaning only when followed by one of the following characters: <code>$</code>, <code>`</code>, <code>"</code>, <code>\</code>, or newline. Within double quotes, backslashes that are followed by one of these characters are removed. Backslashes preceding characters without a special meaning are left unmodified. A double quote may be quoted within double quotes by preceding it with a backslash. If enabled, history expansion will be performed unless an <code>!</code> appearing in double quotes is escaped using a backslash. The backslash preceding the <code>!</code> is not removed. The special parameters <code>*</code> and <code>@</code> have special meaning when in double quotes (see Shell Parameter Expansion).</p> </blockquote> <p>In the specific case asked in the question, $COLUMNS is a special variable which has nonstandard properties (see lhunath's answer above).</p>
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