echo -e "/e[43;35m chenyu/e[0m hello word"

#!/bin/bashfor i in {30..37}do echo -e "/e[1;${i}m chenyu/e[0m hello word"doneecho "--------------"for((i=47; i>=40; --i))do echo -e "/e[$i;$[$i - 10]m chenyu /e[0m abcd/e[1;$[$i - 10]m chenyu/e[0m hello word"done#兩個字符串相加chenyu="chen";chen=${chenyu}"yu"echo $chen#數字相加10a=10;b=$(($c+10));echo $b;#數字相加10c=20;d=$[$c+10];echo $d;