As many other applications gcrontab has a menu bar, a toolbar (or many) a work zone and a status bar. The menu bar and the tool bars are described below, but in this section we are going to see the central zone of the main dialog: the Work zone.
In this zone the main widget is a grid. This grid contains the lines of the crontab file. To modify the lines in the grid, you must select one, and then click in the colum title (the atribute) that you want modify. Then a new dialog appears. This new window is called the cron item dialog, and with this dialog you can edit all the attributes of the cron line. This window has to main parts. The left one have a few controls to specify the desired time item or item range (with optional step). When you have defined all you want you can clik the Add button to add this specification to the selected column in the current line. You can add so many specifications as you want. The right side contains all the specifications that you have done.
When you click in the last colum of the main grid the cron item dialog doesn't appears, then the command dialog does. This dialog contains only two radio buttons, one edit box and a button. First you must select what kind of action you are going to perform when this contrab line is activated, a single command or a list of commands (a file containing commands). You can write in this edit box a command or the name of a file. The button with the "..." label can work in two ways: if you have selected the command radiobutton this button execs the command you have writed else if you have selected the file radiobutton the button shows the file selection dialog.
