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    <p>The <code>$@</code> variable, when quoted will be able to group parameters as they should be:</p> <pre><code>for parameter in "$@" do echo "The parameter is '$parameter'" done </code></pre> <p>If given:</p> <pre><code>head -100 test this "File name" out </code></pre> <p>Will print</p> <pre><code>the parameter is 'head' the parameter is '-100' the parameter is 'test' the parameter is 'this' the parameter is 'File name' the parameter is 'out' </code></pre> <p>Now, all you have to do is parse the loop out. You can use some very simple rules:</p> <ol> <li>The first parameter is always the file name</li> <li>The parameters that follow that start with a dash are parameters</li> <li>After the "--" or once one doesn't start with a "-", the rest are all file names.</li> </ol> <p>You can check to see if the first character in the parameter is a dash by using this:</p> <pre><code>if [[ "x${parameter}" == "x${parameter#-}" ]] </code></pre> <p>If you haven't seen this syntax before, it's a <em>left filter</em>. The <code>#</code> divides the two parts of the variable name. The first part is the name of the variable, and the second is the <strong>glob</strong> filter (not regular expression) to cut off. In this case, it's a single dash. As long as this statement isn't true, you know you have a parameter. BTW, the <code>x</code> may or may not be needed in this case. When you run a test, and you have a string with a dash in it, the test might mistake it for a parameter of the test and not the value.</p> <p>Put it together would be something like this:</p> <pre><code>parameterFlag="" for parameter in "$@" #Quotes are important! do if [[ "x${parameter}" == "x${parameter#-}" ]] then parameterFlag="Tripped!" fi if [[ "x${parameter}" == "x--" ]] then print "Parameter \"$parameter\" ends the parameter list" parameterFlag="TRIPPED!" fi if [ -n $parameterFlag ] then print "\"$parameter\" is a file" else echo "The parameter \"$parameter\" is a parameter" fi done </code></pre>
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