<html> <head> <title>Gri: `unlink' command</title> </head> <body bgcolor="#FFFFFF" text="#000000" link="#0000EE" vlink="#551A8B" alink="FF0000"> <!-- newfile Unlink.html "Gri: `unlink' command" "Gri Commands" --> <!-- @node Unlink, While, System, List Of Gri Commands --> <a name="Unlink" ></a> <img src="./resources/top_banner.gif" usemap="#navigate_top" border="0"> <table summary="top banner" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="150" valign="top"> <font size=-1> <br> Chapters: </br> <a href="Introduction.html">1: Introduction</a><br> <a href="SimpleExample.html">2: Simple example</a><br> <a href="InvokingGri.html">3: Invocation</a><br> <a href="GettingMoreControl.html">4: Finer Control</a><br> <a href="X-Y.html">5: X-Y Plots</a><br> <a href="ContourPlots.html">6: Contour Plots</a><br> <a href="Images.html">7: Image Plots</a><br> <a href="Examples.html">8: Examples</a><br> <a href="Commands.html">9: Gri Commands</a><br> <a href="Programming.html">10: Programming</a><br> <a href="Environment.html">11: Environment</a><br> <a href="Emacs.html">12: Emacs Mode</a><br> <a href="History.html">13: History</a><br> <a href="Installation.html">14: Installation</a><br> <a href="Bugs.html">15: Gri Bugs</a><br> <a href="TestSuite.html">16: Test Suite</a><br> <a href="Acknowledgments.html">17: Acknowledgments</a><br> <a href="License.html">18: License</a><br> <br> Indices:</br> <a href="ConceptIndex.html"><i>Concepts</i></a><br> <a href="CommandIndex.html"><i>Commands</i></a><br> <a href="BuiltinIndex.html"><i>Variables</i></a><br> </font> <td width="500" valign="top"> <map name="navigate_top"> <area alt="index.html#Top" shape="rect" coords="5,2,218,24" href="index.html#Top"> <area alt="ListOfGriCommands.html#ListOfGriCommands" shape="rect" coords="516,2,532,24" href="ListOfGriCommands.html#ListOfGriCommands"> <area alt="Gri: `system' command" shape="rect" coords="557,2,573,24" href="System.html"> <area alt="Gri: `while' command" shape="rect" coords="581,2,599,24" href="While.html"> </map> <map name="navigate_bottom"> <area alt="index.html#Top" shape="rect" coords="5,2,218,24" href="index.html#Top"> <area alt="Gri: `while' command" shape="rect" coords="581,2,599,24" href="While.html"></map> <h3>9.3.50: `<font color="#82140F"><code>unlink</code></font>'</h3> <!-- latex: \index{unlink} --> <TABLE SUMMARY="Example" BORDER="0" BGCOLOR="#efefef" WIDTH="100%"> <TR> <TD> <PRE> <font color="#82140F"> `unlink \filename' </font></PRE> </TD> </TR> </TABLE> Delete a filename and possibly the file to which it refers. On non-unix machines, this simply means to delete the file. On unix machines, the action is more subtle. The unix OS permits several processes to use a given file at once. Therefore, `<font color="#82140F"><code>unlink</code></font>' doesn't immediately remove the file, but instead waits until other processes are done with it. Most users will never realize the difference, however, and it is safe to think of `<font color="#82140F"><code>unlink</code></font>' as simply removing the file. To learn more, type `<font color="#82140F"><code>man unlink</code></font>' in a unix shell. <p> A common use of `<font color="#82140F"><code>unlink</code></font>' is to remove files that were created with the `<font color="82140F"><code>tmpname</code></font>' facility (see <a href="OperatingSystem.html#UsingOSInsideGri">Using OS Inside Gri</a>), e.g. <TABLE SUMMARY="Example" BORDER="0" BGCOLOR="#efefef" WIDTH="100%"> <TR> <TD> <PRE> <font color="#82140F"> \tmp = tmpname # do some system commands to put data into this file open \tmp read columns x y draw curve unlink \tmp </font></PRE> </TD> </TR> </TABLE> <p> </table> <img src="./resources/bottom_banner.gif" usemap="#navigate_bottom" border="0"> </body> </html>