每日桌面腳本的wget圖像問題

我有一個腳本（Nuno 寫的）到wget一個特定站點的圖像並設置我的牆紙。但是我似乎無法修改它以能夠wget從該站點獲取圖像：chromecast

源中的圖像有一個這樣的 url：image

我似乎無法隔離使用的 url，grep因為它很貪婪。我意識到grep -P可以工作，如果我在終端中手動輸入它就可以了。但是在腳本中，分配變數時，它不起作用。變數可以用grep但不能設置grep -P。

#!/bin/bash
# * Name: earthwall.sh
# * Description: Downloads random image from earthview.withgoogle.com and sets as wallpaper on OSX
# * Author: Nuno Serro
# * Date: 09/07/2015 22:24:11 WEST
# * License: This program is free software: you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation, either version 3 of the License, or
#   (at your option) any later version.
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#   You should have received a copy of the GNU General Public License
#   along with this program.  If not, see      <http://www.gnu.org/licenses/>.
#
# * Copyright (c) 2015, Nuno Serro
#PID=$(pgrep gnome-session)
#PID=$(pgrep -f 'gnome-session' | head -n1)
#export DBUS_SESSION_BUS_ADDRESS=$(grep -z DBUS_SESSION_BUS_ADDRESS     /proc/$PID/environ)

mkdir -p ~/Pictures/globewall
cd ~/Pictures/globewall

# Get page index
wget -q https://clients3.google.com/cast/chromecast/home -O ~/Pictures/globewall/.index.html 2&gt; /dev/null
if [ $? -ne 0 ]; then
echo "Failed to get index from google chromecast"
exit 1
fi

# Set image url, name and location
image_url=`cat ~/Pictures/globewall/.index.html | grep lh3.googleusercontent.com | grep -shoP 'https:[\\][\/][\\][\/]lh3(.*?)-mv' -m 1 -o | head -1 | sed 's/\\//g' | sed 's/u003d/=/g'`
image_name= wallpaper.jpg

# Get image
wget -q $image_url -O ~/Pictures/globewall/$image_name 2&gt; /dev/null
if [ $? -ne 0 ]; then
echo "Failed to get image from www.googleusercontent.com"
exit 1
fi

# Change wallpaper
sleep 1
/usr/bin/gsettings set org.gnome.desktop.background picture-options 'zoom'
/usr/bin/gsettings set org.gnome.desktop.background picture-uri "file://~/Pictures/globewall/$image_name"
/usr/bin/gsettings set org.gnome.desktop.screensaver picture-uri "file://~/Pictures/globewall/$image_name"

echo "Wallpaper changed to $image_name"
exit 0

我被困住了。

您的腳本需要進行一些改造。

該行後面的兩行#Set image url, name and location由於各種原因（例如不正確的 grep 語法、不正確的分配）而中斷。此外，您的腳本不會雙引號文件名，這可能會根據情況破壞您的腳本。

為了使它更可靠地工作，我重寫了腳本的核心，如下所示：

#!/bin/bash
fn_basedir=~/Pictures/globewall/
fn_index='.index.html'
fn_image='wallpaper.jpg'

mkdir -p "$fn_basedir"

# Get page index
wget -q "https://clients3.google.com/cast/chromecast/home" -O "${fn_basedir}${fn_index}" 
if [ $? -ne 0 ]; then
 echo "Failed to get index from google chromecast"
 exit 1
fi

# Set image url
image_url=$(grep -oP 'https:\\/\\/lh3(.*?)-mv' "${fn_basedir}${fn_index}" | sed -e 's/\\//g' -e 's/u003d/=/g' | head -1)

# Get image
wget -q "$image_url" -O "${fn_basedir}${fn_image}" 
if [ $? -ne 0 ]; then
 echo "Failed to get image from www.googleusercontent.com"
 exit 1
fi

# Change wallpaper
sleep 1
/usr/bin/gsettings set org.gnome.desktop.background picture-options 'zoom'
/usr/bin/gsettings set org.gnome.desktop.background picture-uri "file://${fn_basedir}${fn_image}"
/usr/bin/gsettings set org.gnome.desktop.screensaver picture-uri "file://${fn_basedir}${fn_image}"

echo "Wallpaper changed to ${fn_image}"
exit 0

很棒的圖片順便說一句！

引用自：https://unix.stackexchange.com/questions/493308