Linux-shell脚本-if语句/case语句

if语句

格式

if  条件
then
Command
else
Command
fi

example

#!/bin/bash
number=150
if[ $number -gt 300]
then
echo "Number is greater"
elif[ $number -lt 300]
then
echo "Number is Smaller"
else
echo "Number is equal to actual value"
fi

case语句

格式

case 条件 in
xxx)
commands;;
xxx)
commands;;
xxx)
commands;;
esac

example

#!/bin/bash

echo "is it morning ,input yes or no"
read time

case $time in
yes|y)
echo "oh, good morning";;
no|n)
echo "oh, good afternoon";;
*)
echo "oh, your input is not connect"
esac