info.plist - xmlstarlet不返回指定的节点

Question

我正在尝试使用xmlstartlet解析info.plist (针对iOS应用程序)。我是在MacBook专业版上用OSX做这件事的。这是我的info.plist：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>UIRequiresFullScreen</key>
    <true/>
    <key>ITSAppUsesNonExemptEncryption</key>
    <false/>
    <key>UIDeviceFamily</key>
    <array>
        <integer>1</integer>
        <integer>2</integer>
    </array>
    <key>UISupportedInterfaceOrientations</key>
    <array>
        <string>UIInterfaceOrientationLandscapeLeft</string>
        <string>UIInterfaceOrientationLandscapeRight</string>
        <string>UIInterfaceOrientationPortrait</string>
    </array>
    <key>UISupportedInterfaceOrientations~ipad</key>
    <array>
        <string>UIInterfaceOrientationPortrait</string>
        <string>UIInterfaceOrientationPortraitUpsideDown</string>
        <string>UIInterfaceOrientationLandscapeLeft</string>
        <string>UIInterfaceOrientationLandscapeRight</string>
    </array>
    <key>MinimumOSVersion</key>
    <string>9.3</string>
    <key>CFBundleDisplayName</key>
    <string>My iOS App</string>
    <key>CFBundleIdentifier</key>
    <string>local.nowhere.MyiOSApp</string>
    <key>CFBundleShortVersionString</key>
    <string>3.3.0</string>
    <key>NSAppTransportSecurity</key>
    <dict>
        <key>NSAllowsArbitraryLoads</key>
        <true/>
    </dict>
    <key>UISupportedExternalAccessoryProtocols</key>
    <key>UIBackgroundModes</key>
    <array>
        <string>external-accessory</string>
    </array>
    <key>UIAppFonts</key>
    <array>
        <string>FontAwesome.ttf</string>
    </array>
    <key>CFBundleVersion</key>
    <string>321</string>
    <key>NSLocationWhenInUseUsageDescription</key>
    <array>
        <string>Location enabled?</string>
    </array>
    <key>NSCameraUsageDescription</key>
    <string>needs access to the camera</string>
    <key>NSPhotoLibraryUsageDescription</key>
    <string>needs access to photos</string>
    <key>NSCalendarsUsageDescription</key>
    <string>needs access to the calendar</string>
    <key>NSBluetoothPeripheralUsageDescription</key>
    <string>needs access to bluetooth</string>
    <key>UIStatusBarStyle</key>
    <string>UIStatusBarStyleLightContent</string>
    <key>UIViewControllerBasedStatusBarAppearance</key>
    <false/>
    <key>XSAppIconAssets</key>
    <string>Resources/Media.xcassets/AppIcons.appiconset</string>
    <key>XSLaunchImageAssets</key>
    <string>Resources/Media.xcassets/LaunchImages.launchimage</string>
</dict>
</plist>

下面是我的xmlstarlet命令：

xmlstarlet sel -t -m "/plist/dict[key='CFBundleVersion']" -v string ./Info.plist

下面是输出：

Attempt to load network entity http://www.apple.com/DTDs/PropertyList-1.0.dtd
9.3
My iOS App
local.nowhere.MyiOSApp
3.3.0
321
needs access to the camera
needs access to photos
needs access to the calendar
needs access to bluetooth
UIStatusBarStyleLightContent
Resources/Media.xcassets/AppIcons.appiconset
Resources/Media.xcassets/LaunchImages.launchimage

你知道为什么它会在那个级别返回所有的'string‘节点吗？

Answer 1

您正在匹配dict并获取string的值，所以它返回dict中的所有字符串。

检查是否存在值为CFBundleVersion的key元素并不做任何事情，如果是，则只选择dict。

尝试选择key本身，然后获取第一个后续同级string的值……

xmlstarlet sel --net -t -m "/plist/dict/key[.='CFBundleVersion']" -v "following-sibling::string[1]" ./Info.plist

这将返回：

321

Answer 2

或者为了更快地运行上面的版本(因为我不能对它发表评论)，不要查找DTD并忽略STDERR：

xmlstarlet sel -t -m "/plist/dict/key[text()='CFBundleVersion']" -v "following-sibling::string[1]" ./Info.plist 2>/dev/null