028_shell脚本递归求值

一、

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#!/bin/sh factorial() {   if [ "$1" -gt "1" ]; then     i=`expr $1 - 1`     j=`factorial $i`     k=`expr $1 \* $j`     echo $k   else     echo 1   fi }     while : do   echo "Enter a number:"   read x   factorial $x done

二、

效果:shell实现阶乘计算

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➜ ✗ bash test.sh Enter a number: 3 6 Enter a number: 4 24 Enter a number: 5 120 Enter a number:

Reference:https://www.shellscript.sh/     #Shell Scripting Tutorial