<!--Copyright (C) 1988-2005 by the Institute of Global Environment and Society (IGES). See file COPYRIGHT for more information.--> <html> <head> <title>GrADS Command: open</title> </head> <body bgcolor="e0f0ff" text="#000000"> <h2><b>open</b></h2> <p> <code>open <i>filename</i></code> <p> Opens <code><i>filename</i></code>, which should be the name of a GrADS data descriptor file, also called a control file. <p> <h3>Usage Notes</h3> <p> <ol> <li>The standard file extension for Grads data descriptor files is <code>.ctl</code>. Provided you adhere to this standard, there is no need to type the extension <code>.ctl</code> when issuing the <code>open</code> command. <p> <li>You will need to open at least one data-descriptor file before you can enter other GrADS commands. <p> <li>You can open more than one data-descriptor file. Each file is numbered according to the order in which it was opened. </ol> <p> <h3>Examples </h3> <p> <code> open jandata.1966<br> open jandata.1966.ctl </code> </ul><p> <p> Both of these commands will have the same effect -- opening the GrADS data descriptor file <code>"jandata.1966.ctl"</code>. </body> </html>
