new Command("env", async function(term, argv) {
    if(argv.length === 1) {
        try {
            return await term.exec("printenv");
        } catch(err) {
            term.print("Unexpected error while trying to run `printenv`: " + err + "\n")
        }
    }
    let quiet = false;
    if(argv.length === 3 && argv[1] === '-qt') {
        argv = [argv[0], argv[2]];
        quiet = true;
    }
    /* make sure the binary exists: */
    if(!(argv[1] in term.commands)) {
        if("PATH" in term.env) {
            const bins = term.env["PATH"].split(':');
            for(let i=0; i<bins.length; ++i) {
                const files = term.listdir(bins[i]);
                if(!files["exists"]) {
                    continue;
                }
                for(let j= 0; j<files["files"].length; ++j) {
                    const file = files["files"][j];
                    if(!(file['umask'] & 0o5)) {
                        continue; /* the file isn't redable and executable */
                    }
                    if(file['name'] === argv[1]) {
                        /* load the file */
                        let failed = false;
                        $.ajax({
                            url: file['url'],
                            dataType: "script",
                            async: false,
                            success: () => {
                                let dir = bins[i];
                                if (!dir.endsWith('/')) {
                                    dir += '/';
                                }
                                if (argv[1] in Terminal.prototype.commands) {
                                    Terminal.prototype.commands[argv[1]].path = dir + argv[1];
                                    console.log("Loaded command `" + argv[1] + "` from " + file['url']);
                                } else {
                                    error("TODO: Implement");
                                }
                            },
                            error: (xhr, ajaxOptions, thrownError) => {
                                term.print("Filesystem error: Ajax query to sultanik.com failed while trying to ")
                                term.print("download <a href=\"" + file['url'] + "\">" + file['url'] + "</a>\n");
                                console.log(thrownError);
                                term.print("Please make sure you are connected to the Internet and try again later.\n");
                                failed = true;
                            }
                        });
                        if(failed) {
                            return 127;
                        }
                    }
                }
            }
        }
    }
    if(quiet) {
        return 0;
    }
    let ret;
    if(argv[1] in term.commands) {
        try {
            ret = await term.commands[argv[1]].exec(term, argv.slice(1));
        } catch(err) {
            term.print("env: command " + argv.slice(1) + " failed with an unexpected error:\n" + err.stack + "\n");
            ret = -1;
        }
    } else {
        term.print("evansh: command not found: " + argv[1] + "\n");
        ret = 127;
    }
    if(ret !== undefined && ret !== 0) {
        term.print("evansh: exit " + ret + "\n");
    }
    return ret;
});