在shell腳本中分配變量

Question

#!/bin/sh 
SUCCESS=0 
java -jar sbc.jar & 
while [ true ]; 
do 
echo "sleeping" 
sleep 5 
echo "again" 
tail -1 ~/NetBeansProjects/xyz/dist/newlog.log | grep -q "[INFO ] - Stream closed" 
if [ $? = 1 ] 
then 
echo " entered if " 
java -jar sbc.jar & 
else 
echo " did not if " 
fi 
done 

我想使用比$更好的變量嗎？存儲前一行的結果，因爲我可能需要它多次。該腳本旨在檢查文件newlog.log的最後一行以查看特定的字符串，然後再次啓動sbc.jar，因爲該字符串確認程序已停止。

Answer 1

儲存於另一個變量：

... 
tail -1 ~/NetBeansProjects/xyz/dist/newlog.log | grep -q "[INFO ] - Stream closed" 
RES=$? 
if [ $RES = 1 ] 
...