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copied!<ul> <li><code>$1</code>, <code>$2</code>, <code>$3</code>, ... are the <a href="https://www.gnu.org/software/bash/manual/html_node/Positional-Parameters.html" rel="noreferrer">positional parameters</a>.</li> <li><code>"$@"</code> is an array-like construct of all positional parameters, <code>{$1, $2, $3 ...}</code>.</li> <li><code>"$*"</code> is the IFS expansion of all positional parameters, <code>$1 $2 $3 ...</code>.</li> <li><code>$#</code> is the number of positional parameters.</li> <li><code>$-</code> current options set for the shell.</li> <li><code>$$</code> pid of the current shell (not subshell).</li> <li><code>$_</code> most recent parameter (or the abs path of the command to start the current shell immediately after startup).</li> <li><code>$IFS</code> is the (input) field separator.</li> <li><code>$?</code> is the most recent foreground pipeline exit status.</li> <li><code>$!</code> is the PID of the most recent background command.</li> <li><code>$0</code> is the name of the shell or shell script.</li> </ul> <p>Most of the above can be found under <a href="https://www.gnu.org/software/bash/manual/html_node/Special-Parameters.html" rel="noreferrer">Special Parameters</a> in the Bash Reference Manual. There are all the <a href="https://www.gnu.org/software/bash/manual/html_node/Shell-Variables.html" rel="noreferrer">environment variables set by the shell</a>.</p> <p>For a comprehensive index, please see the <a href="https://www.gnu.org/software/bash/manual/html_node/Variable-Index.html" rel="noreferrer">Reference Manual Variable Index</a>.</p>

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