# Using Variables To expand a variable in shell script, prefix the variable name with a dollar sign. For example: \begin{md} ``` foo=hello echo $foo ``` \end{md} The variable \begin{md}`$foo`\end{md} is substituted with its value, if any, after the expansion. In the above example, \begin{md}`$foo`\end{md} expands to `hello`, so the output looks like this: ``` hello ``` <input type="checkbox" id="mortytoggle" autocomplete="off" /> <div id="mortyheader"> <form method="get"> <label for="mortytoggle">hide</label> <span><a href="/">Morty Proxy</a></span> <input type="url" value="https://susam.github.io/texme/examples/shell-script-protected.html" name="mortyurl" /> This is a <a href="https://github.com/asciimoo/morty">proxified and sanitized</a> view of the page, visit <a href="https://susam.github.io/texme/examples/shell-script-protected.html" rel="noreferrer">original site</a>. </form> </div> <style> body{ position: absolute !important; top: 42px !important; left: 0 !important; right: 0 !important; bottom: 0 !important; } #mortyheader { position: fixed; margin: 0; box-sizing: border-box; -webkit-box-sizing: border-box; top: 0; left: 0; right: 0; z-index: 2147483647 !important; font-size: 12px; line-height: normal; border-width: 0px 0px 2px 0; border-style: solid; border-color: #AAAAAA; background: #FFF; padding: 4px; color: #444; height: 42px; } #mortyheader * { padding: 0; margin: 0; } #mortyheader p { padding: 0 0 0.7em 0; display: block; } #mortyheader a { color: #3498db; font-weight: bold; display: inline; } #mortyheader label { text-align: right; cursor: pointer; position: fixed; right: 4px; top: 4px; display: block; color: #444; } #mortyheader > form > span { font-size: 24px; font-weight: bold; margin-right: 20px; margin-left: 20px; } input[type=checkbox]#mortytoggle { display: none; } input[type=checkbox]#mortytoggle:checked ~ div { display: none; visibility: hidden; } #mortyheader input[type=url] { width: 50%; padding: 4px; font-size: 16px; } </style>