update script curl

install-4dage

@@ -12,11 +12,15 @@ command_exists() {
     return 0
 }
 ## command exsits
+if ! command_exists "curl"; then
+    echo "curl not installed."
+    exit 1
+fi
 if ! command_exists "4dage-ffmpeg"; then
-    /bin/bash -c "$(curl -fsSL http://192.168.0.115:3000/zhangyupeng/4dage-ffmpeg/raw/master/4dage-ffmpeg)" >$HOMEDIR/4dage-ffmpeg
-    ln -s $HOMEDIR/4dage-ffmpeg
+    curl -fsSL http://192.168.0.115:3000/zhangyupeng/4dage-ffmpeg/raw/master/4dage-ffmpeg $HOMEDIR/4dage-ffmpeg
+    ln -s $HOMEDIR/4dage-ffmpeg /usr/local/bin/4dage-ffmpeg
 else
-    /bin/bash -c "$(curl -fsSL http://192.168.0.115:3000/zhangyupeng/4dage-ffmpeg/raw/master/4dage-ffmpeg)" >$HOMEDIR/4dage-ffmpeg
+    curl -fsSL http://192.168.0.115:3000/zhangyupeng/4dage-ffmpeg/raw/master/4dage-ffmpeg $HOMEDIR/4dage-ffmpeg
 fi
 
 chmod a+x $HOMEDIR/4dage-ffmpeg