wget function for batch downloading

wget_extension.md

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+# Wget Batch Download Based on File Extensions
+* tutorial video: [Link](https://www.youtube.com/watch?v=oWRBjLy8B-I)
+* offical website: [Link](https://www.youtube.com/user/gotbletu)
+
+### install requirements
+    wget
+
+### configuration
+    vim ~/.bashrc or vim ~/.zshrc
+    
+    #-------- Wget (Retrieve Files From The Web) {{{
+    #------------------------------------------------------
+    wget-extension() {
+      if [ $# -lt 2 ]; then
+        echo -e "Download all files with specific extension on a webpage"
+        echo -e "\nUsage: $0 <file_extension> <url>"
+        echo -e "\nExample:\n$0 mp4 http://example.com/files/"
+        echo -e "$0 mp3,ogg,wma http://samples.com/files/"
+        echo -e "\nGoogle: http://lmgtfy.com/?q=intitle%3Aindex.of+mp3+-html+-htm+-php+-asp+-txt+-pls+madonna"
+        return 1
+      fi
+    
+      outputdir_name=$(echo "$2" | rev | cut -d\/ -f2 | rev)
+      mkdir -pv "$outputdir_name"
+      cd "$outputdir_name" && wget -r -l1 -H -t1 -nd -N -np -A "$1" -erobots=off "$2"
+    }
+    
+    # }}}
+    
+
+### references
+- https://www.youtube.com/watch?v=oWRBjLy8B-I
+- http://stackoverflow.com/a/18709707
+
+### contact
+
+                 _   _     _      _         
+      __ _  ___ | |_| |__ | | ___| |_ _   _ 
+     / _` |/ _ \| __| '_ \| |/ _ \ __| | | |
+    | (_| | (_) | |_| |_) | |  __/ |_| |_| |
+     \__, |\___/ \__|_.__/|_|\___|\__|\__,_|
+     |___/                                  
+
+- http://www.youtube.com/user/gotbletu
+- https://twitter.com/gotbletu
+- https://plus.google.com/+gotbletu
+- https://github.com/gotbletu
+- gotbletu@gmail.com
+
+