Detect-It-Easy/db/shell-script

// Retrieve the interpreter from a #! script.

var sInterpreter;
if (typeof sInterpreter === "undefined") {
    sInterpreter = "";
    var sLine = Binary.getString(0);
    // Make the expression a little easier to deal with by translating
    // something like "/usr/bin/env perl" to just "/usr/bin/perl".
    sLine = sLine.replace(/\/env\s+/, "/");
    var aMatch = sLine.match(/#!.*\/(.+?)(?:\.exe)?\s/);
    if (aMatch) {
        sInterpreter = aMatch[1];
    }
}

// Check for a particular interpreter.
function isInterpreter(sString) {
    if (sInterpreter == sString) {
        // Found it, so blank it out to stop "script.2" picking it up again.
        sInterpreter = "";
        return 1;
    }
    return 0;
}