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$ cat app.sh #應用程序的代碼
#!/bin/bash
FIFO=fifo_test
while :;
do
CI=`cat $FIFO` #CI --> Control Info
case $CI in
0) echo "The CONTROL number is ZERO, do something ..."
;;
1) echo "The CONTROL number is ONE, do something ..."
;;
*) echo "The CONTROL number not recognized, do something else..."
;;
esac
done
$ cat control.sh #控制程序的代碼
#!/bin/bash
FIFO=fifo_test
CI=$1
[ -z "$CI" ] && echo "the control info should not be empty" && exit
echo $CI > $FIFO
$ chmod +x app.sh control.sh #修改這兩個程序的可執行權限，以便用戶可以執行它們
$ ./app.sh #在一個終端啟動這個應用程序，在通過./control.sh發送控制碼以后查看輸出
The CONTROL number is ONE, do something ... #發送1以后
The CONTROL number is ZERO, do something ... #發送0以后
The CONTROL number not recognized, do something else... #發送一個未知的控制碼以后
$ ./control.sh 1 #在另外一個終端，發送控制信息，控制應用程序的工作
$ ./control.sh 0
$ ./control.sh 4343
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