[base]
name=CentOS-$releasever - Base
mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
#baseurl=http://mirror.centos.org/centos/$releasever/os/$basearch/
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
显示以下行，它是一个shell脚本。
echo $releasever要在终端输入<?php
if(isset($_POST["searchBtn"]))
{
$strInputSuburb = "";
$strInputStreet = "";
$strInputSuburb = $_POST["suburb"];
$strInputStreet = $_POST["street"];
if(!empty($strInputSuburb) || !empty($strInputStreet))
{
$conn = @mysqli_connect("localhost", "example", "exmaple")
or die ("Failed to connect server");
@mysqli_select_db($conn, "example")
or die ("Database not available");
$querySql1 = "select * from Infringement
where suburb like '%$strInputSuburb%' and street1 like '%$strInputStreet%'
order by Fines($) acs";***// After adding this line, it always said: Problem Query***
$result1 = mysqli_query($conn, $querySql1)
or die ("Problem Query...");.***// when I delete die function, it said cannot find the parameters.***
$count = mysqli_num_rows($result1);
if(!count==0){
echo "<div class='table-responsive row' id='tableTop'>";
echo "<div class='col-md-10 col-md-offset-1'>";
echo "<table class='table table-bordered table-hover '>";
echo "<tr><th>Location</th><th>Suburb</th><th>No. of Infringements</th><th>Fines($)</th></tr>";
while($Row = mysqli_fetch_row($result1)){
echo "<tr><td>Intersection of ".$Row[1]." and ".$Row[2]."</td><td>".$Row[3]."</td><td>".$Row[4]."</td><td>".$Row[5]."</td></tr>";
}
echo "</table>";
echo "</div>";
echo "</div>";
}
else {
echo "No data found! Please search again!";
}
mysqli_free_result($result1);
mysqli_close($conn);
}
else {
echo "<div style='padding-top:9px;color:grey' class='col-md-3 col-md-offset-2'>";
echo "Please type any <b>Suburb</b> or <b>Street</b>.";
echo "</div>";
}
}
?>
，屏幕上没有任何输出。
如何获得$ releasever，$ arch，$ basearch的价值？
答案 0 :(得分：3)
您可以使用此命令：
python -c 'import yum, pprint; yb = yum.YumBase(); pprint.pprint(yb.conf.yumvar, width=1)'
答案 1 :(得分：1)
这些不是shell变量，因此您不希望能够在bash中打印它们。这些是yum提供的值。 This answer讨论了如何以编程方式获取它们，但总的来说：
releasever是您的CentOS版本的主要版本;基本上，rpm -q --qf='%{VERSION}\n' centos-release basearch是您的系统架构，可以使用uname -m arch变量infra显然是新的，可能无法使用，基于this post 有一些文档here，虽然旧的仍然准确。