awk string parsing uses shell variables

I need to parse user input parameters in shell file, so I do some research for it..

1.shell parameter format:

VAR=$(expr.)

2. awk function to replace string:  gsub("target string","replace string")
   sed way:                                      sed 's/target string/replace string/g'

3. awk use shell parameters : -v
   str1="shell value"
   echo awk -v S_RN=${str1} '{ print S_RN}'

Through 1 to 3 steps, we can use parameters from user input in awk function. 
See below example:
command line:

./test.sh "-i $RN -c -a"

test.sh:

RN=$RANDOM

FLAG=$(echo $1| awk -v S_RN=${RN} '{gsub("\$RN",S_RN);print}')

Java UI 元件透明

因為要JtabbedPane 的每個tab panel空出一個區塊統一去顯示Log訊息，所以把JtabbedPane的背景設為透明，讓每個tab panel都空出一個預設區塊去顯示Log panel.



JPanel 透明語法:

JPanel  trPanel = new JPanel ();
trPanel.setBackground(null);
trPanel.setOpaque(false);

JTabbedPane 透明語法:

UIManager.put("TabbedPane.contentOpaque", false);
JTabbedPane trTabbePane = new JTabbedPane();

JFrame 設定背景顏色:

JFrame jf = JFrame();
jf.getContentPane().setBackground(Color.RED);