Shell 無知的雜記

字串變數比對
if [ "$A" =="$B" ] then
echo "ok"
fi

置換單字
echo "ABC" |tr "A" "R"

變數加總

times=0

until [ "$times" = 3 ];

do

echo "I love linux."

sleep 2

times=`expr $times + 1`

done

REF:http://b123.hlc.edu.tw/shellscript.htm