How to install and use at job scheduling?

linux scheduling at

1,663

Solution 1

Depending on your Linux distribution and the kind of installation (minimal, desktop-centric, etc.) at (and atd the at job scheduler daemon) is installed by default or not.

To verify it you can issue commands like:

$ which at
/usr/bin/at
$ which atd
/usr/bin/atd
$ yum whatprovides atd # to get the package name 
$ yum info pkg-name # to see if it is installed

(assuming yum is available on Suse - using a Fedora system here)

If the package is not installed you can install it via your package manager, e.g. something like:

$ yum install at # on fedora at least

If it is installed, perhaps the daemon is not started on bootup by default.

To see if it running:

$ pgrep -l atd

Or just test it like this

$ echo echo hello world | at now

(watch your system logs in another terminal and/or check your local mailbox)

How to start it depends on your init-system, if it is old-school it would be something like:

$ /etc/init.d/atd start

If it is systemd it would be something like:

$ systemctl start atd

For a init.d based system as well for the systemd one there are also commands to display the status of a service like atd and to make it startup on boot.

But most likely atd is started by default after installation and it is setup by default to be started at system boot.

Solution 2

Essential on most systems, is a daemon, usually atd

1,663

Dinesh

Updated on September 18, 2022

Comments

Dinesh almost 2 years

I am using a Slider component from Filament Group. You can view the component here http://filamentgroup.com/lab/update_jquery_ui_slider_from_a_select_element_now_with_aria_support/

We have modified the style sheet to remove the labels and Drop-downs, which we doesn't needed. Then i have tried to change the Slider Handles with some custom images. We are getting some weird result. Slider is not displaying the Handles itself.

Is there anybody has some samples to change the Slider handles? I am not sure, what i am doing wrong.

Code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
    <head>
        <meta http-equiv="content-type" content="text/html; charset=utf-8" />

        <title>Using Progressive Enhancement to Convert a Select Box Into an Accessible jQuery UI Slider</title>

        <script type="text/javascript" src="js/jquery-1.4.3.min.js"></script>
        <script type="text/javascript" src="js/jquery-ui-1.8.16.custom.min.js"></script>
        <script type="text/javascript" src="js/selectToUISlider.jQuery.js"></script>

        <link rel="stylesheet" href="css/redmond/jquery-ui-1.8.16.custom.css" type="text/css" /> 
        <script type="text/javascript">
            $(function(){
                $('select#valueA, select#valueb').selectToUISlider(); 
            }); 
        </script>   
    </head> 
    <body>  
        <div style="margin-top:65px;">
            <fieldset> 
                <select name="valueA" id="valueA" style="display:none">
                    <option value="6am">6:00</option>
                    <option value="7am">7:00</option>
                    <option value="8am">8:00</option>
                    <option value="9am" selected="selected">9:00</option>
                    <option value="10am">10:00</option>
                    <option value="11am">11:00</option>
                    <option value="Noon">Noon</option>
                    <option value="1pm">1:00</option>
                    <option value="2pm">2:00</option>
                    <option value="3pm">3:00</option>
                    <option value="4pm">4:00</option>
                    <option value="5pm">5:00</option>
                    <option value="6pm">6:00</option>
                    <option value="7pm">7:00</option>
                    <option value="8pm">8:00</option>
                    <option value="9pm">9:00</option>
                    <option value="10pm">10:00</option>
                    <option value="11pm">11:00</option>
                    <option value="12pm">12:00</option>
                </select>
                <select name="valueB" id="valueB" style="display:none">
                    <option value="6am">6:00</option>
                    <option value="7am">7:00</option>
                    <option value="8am">8:00</option>
                    <option value="9am">9:00</option>
                    <option value="10am">10:00</option>
                    <option value="11am">11:00</option>
                    <option value="Noon">Noon</option>
                    <option value="1pm">1:00</option>
                    <option value="2pm">2:00</option>
                    <option value="3pm">3:00</option>
                    <option value="4pm">4:00</option>
                    <option value="5pm">5:00</option>
                    <option value="6pm">6:00</option>
                    <option value="7pm">7:00</option>
                    <option value="8pm">8:00</option>
                    <option value="9pm" selected="selected">9:00</option>
                    <option value="10pm">10:00</option>
                    <option value="11pm">11:00</option>
                    <option value="12pm">12:00</option>
                </select>
            </fieldset> 
        </div>  
    </body>
</html>

Style: (I Couldn't post the complete style)

fieldset { border:0; padding:4px 10px; margin-top:10px;}/*
        label {font-weight: normal; margin-right: .5em; font-size: 1.1em;} 
        select {margin-right: 1em;} */
        .ui-slider {clear: both; }

.ui-slider { text-decoration: none !important; position: relative; text-align: left; height:4px; border: 1px solid #fcfdfd; background: #FFFFFF url(images/jslider.plastic.png) 0 0px repeat-x;}
.ui-slider .ui-slider-range { position: absolute; z-index: 1; font-size: 10px; display: block; border: 0; }
.ui-slider .ui-slider-handle  
{
    position: absolute; 
    z-index: 2; 
    width: 1.2em;
    /*height: 1.4em;*/ 
    cursor: default;
    overflow: visible !important;
    background: #FFFFFF url(images/jslider.plastic.png) 0 -40px repeat-x; 
}

.ui-slider-horizontal { height: 20px; }
.ui-slider-horizontal .ui-slider-handle { top: -.3em; margin-left: -.6em;background: #FFFFFF url(images/jslider.plastic.png) 0 -40px repeat-x; }
.ui-slider-horizontal .ui-slider-range { top: 0; height:4px; border: 1px solid #5F5F5F; background: #5c9ccc url(images/jslider.plastic.png) 0 -20px;}
.ui-slider-horizontal .ui-slider-range-min { left: 0; }
.ui-slider-horizontal .ui-slider-range-max { right: 0; } 


.ui-slider .ui-slider-handle .ui-state-hover, .ui-slider .ui-slider-handle .ui-state-focus { 
    background: #f5f8f9 url(images/jslider.plastic.png) 0 -40px repeat-x; 
    font-weight: bold; color: #1d5987; outline: none; }

.ui-slider .ui-slider-handle .ui-state-active { /*border: 1px solid #79b7e7; */background: #f5f8f9 url(images/jslider.plastic.png) 0 -40px repeat-x; font-weight: bold; color: #e17009; outline: none; }

.ui-slider .ui-slider-tooltip {
    display: none;
}
.ui-slider .screenReaderContext {
    position: absolute;
    width: 0;
    height: 0;
    overflow: hidden;
    left: -999999999px;
}
.ui-slider .ui-state-active .ui-slider-tooltip, .ui-slider .ui-state-focus .ui-slider-tooltip, .ui-slider .ui-state-hover .ui-slider-tooltip {
    display: block;
    position: absolute;
    bottom: 2.5em;
    text-align: center;
    /*padding: .3em .2em .4em;*/
    font-size: 10px;
    width: 8em;
    margin-left: -3.7em;
}
.ui-slider .ui-slider-tooltip .ui-tooltip-pointer-down, .ui-slider .ui-slider-tooltip .ui-tooltip-pointer-down-inner {
    position: absolute; 
    display: block;
    width:0; 
    height:0; 
    border-bottom-width: 0;
    background: none;
}
.ui-slider .ui-slider-tooltip .ui-tooltip-pointer-down {    
    border-left: 7px dashed transparent; 
    border-right: 7px dashed transparent;
    border-top-width: 8px;
    bottom: -8px;
    right: auto;
    left: 50%;
    margin-left: -7px;
}
.ui-slider .ui-slider-tooltip .ui-tooltip-pointer-down-inner {
    border-left: 6px dashed transparent; 
    border-right: 6px dashed transparent;
    border-top: 7px solid #fff;
    bottom: auto;
    top: -9px;
    left: -6px;
}
.ui-slider a {
    text-decoration: none;
}
.ui-slider ol, .ui-slider li, .ui-slider dl, .ui-slider dd, .ui-slider dt {
    list-style: none;
    margin: 0;
    padding: 0;
}
.ui-slider ol, .ui-slider dl {
    position: relative;
    top: 1.3em;
    width: 100%;
}
.ui-slider dt {
    top: 1.5em;
    position: absolute;
    padding-top: .2em;
    text-align: center;
    border-bottom: 1px dotted #ddd;
    height: .7em;
    color: #999;
}
.ui-slider dt span {
    background: #fff;
    padding: 0 .5em;
}
.ui-slider li, .ui-slider dd {
    position: absolute;
    overflow: visible;
    color: #666;
}
.ui-slider span.ui-slider-label {
    position: absolute;
}
.ui-slider li span.ui-slider-label, .ui-slider dd span.ui-slider-label {
    display: none;
}
.ui-slider li span.ui-slider-label-show, .ui-slider dd span.ui-slider-label-show 
{
    display: block;
    font-family:Arial, Helvetica, sans-serif;
    color:#5f5f5f;
    font-weight:bold;
    font-size:11px;
}
.ui-slider span.ui-slider-tic {
    position: absolute;
    left: 0;
    height: 5px;
    top: -1.3em;
}
.ui-slider li span.ui-widget-content, .ui-slider dd span.ui-widget-content {
    border-right: 0;
    border-left-width: 1px;
    border-left-style: solid;
    border-top: 0;
    border-bottom: 0;
}
.ui-slider .first .ui-slider-tic, .ui-slider .last .ui-slider-tic {
    display: none;
}

Cratylus almost 11 years

I was looking through a book on SUSE and it said "You can use YaST to add at to the current run level." So I could not figure out what this means and if I would have at available in any system I run my script or not
schaiba almost 11 years

To see if it's running, try 'ps aux | grep atd'. To check if it's installed, use 'whereis atd'. To see if it's set to run on boot, that depends on the init system you're using. Hope this is helpful.