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<!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"> <head> <meta http-equiv="Content-Type" content= "application/xhtml+xml; charset=iso-8859-1" /> <title> 11.6. Configuring the setclock Script </title> <link rel="stylesheet" href="../stylesheets/lfs.css" type="text/css" /> <meta name="generator" content="DocBook XSL Stylesheets V1.69.1" /> <link rel="stylesheet" href="../stylesheets/lfs-print.css" type= "text/css" media="print" /> </head> <body id="lfs" class="CLFS-SVN-20060417-x86_64-Pure64"> <div class="navheader"> <div class="headertitles"> <h4> Cross-Compiled Linux From Scratch - Version CLFS-SVN-20060417-x86_64-Pure64 </h4> <h3> Chapter 11. Setting Up System Bootscripts </h3> </div> <ul class="headerlinks"> <li class="prev"> <a accesskey="p" href="udev.html" title= "Device and Module Handling on an LFS System">Prev</a> <p> Device and Module Handling on an LFS System </p> </li> <li class="next"> <a accesskey="n" href="console.html" title= "Configuring the Linux Console">Next</a> <p> Configuring the Linux Console </p> </li> <li class="up"> <a accesskey="u" href="chapter.html" title= "Chapter 11. Setting Up System Bootscripts">Up</a>. </li> <li class="home"> <a accesskey="h" href="../index.html" title= "Cross-Compiled Linux From Scratch - Version CLFS-SVN-20060417-x86_64-Pure64"> Home</a> </li> </ul> </div> <div class="sect1" lang="en" xml:lang="en"> <div class="titlepage"> <h1 class="sect1"> 11.6. Configuring the setclock Script </h1> </div> <p> The <span><strong class="command">setclock</strong></span> script reads the time from the hardware clock, also known as the BIOS or the Complementary Metal Oxide Semiconductor (CMOS) clock. If the hardware clock is set to UTC, this script will convert the hardware clock's time to the local time using the <tt class= "filename">/etc/localtime</tt> file (which tells the <span><strong class="command">hwclock</strong></span> program which timezone the user is in). There is no way to detect whether or not the hardware clock is set to UTC, so this needs to be configured manually. </p> <p> If you cannot remember whether or not the hardware clock is set to UTC, find out by running the <strong class="userinput"><tt>hwclock --localtime --show</tt></strong> command. This will display what the current time is according to the hardware clock. If this time matches whatever your watch says, then the hardware clock is set to local time. If the output from <span><strong class= "command">hwclock</strong></span> is not local time, chances are it is set to UTC time. Verify this by adding or subtracting the proper amount of hours for the timezone to the time shown by <span><strong class="command">hwclock</strong></span>. For example, if you are currently in the MST timezone, which is also known as GMT -0700, add seven hours to the local time. </p> <p> Change the value of the <tt class="envar">UTC</tt> variable below to a value of <tt class="option">0</tt> (zero) if the hardware clock is <span class="emphasis"><em>not</em></span> set to UTC time. </p> <p> Create a new file <tt class="filename">/etc/sysconfig/clock</tt> by running the following: </p> <pre class="userinput"><kbd class="command">cat > /etc/sysconfig/clock << "EOF"<tt class="literal"># Begin /etc/sysconfig/clockUTC=1# End /etc/sysconfig/clock</tt>EOF</kbd></pre> <p> A good hint explaining how to deal with time on LFS is available at <a href= "http://www.linuxfromscratch.org/hints/downloads/files/time.txt"><i>http://www.linuxfromscratch.org/hints/downloads/files/time.txt</i></a>. It explains issues such as time zones, UTC, and the <tt class= "envar">TZ</tt> environment variable. </p> </div> <div class="navfooter"> <ul> <li class="prev"> <a accesskey="p" href="udev.html" title= "Device and Module Handling on an LFS System">Prev</a> <p> Device and Module Handling on an LFS System </p> </li> <li class="next"> <a accesskey="n" href="console.html" title= "Configuring the Linux Console">Next</a> <p> Configuring the Linux Console </p> </li> <li class="up"> <a accesskey="u" href="chapter.html" title= "Chapter 11. Setting Up System Bootscripts">Up</a>. </li> <li class="home"> <a accesskey="h" href="../index.html" title= "Cross-Compiled Linux From Scratch - Version CLFS-SVN-20060417-x86_64-Pure64"> Home</a>. </li> </ul> </div> </body></html>⌨️ 快捷键说明
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