bash脚本一些语句的语法

if:

if [ $num1 -eq $num2 ];then
    echo true
else
    echo false
fi

(-eq =, -lt <, -gt >, -a and, -o or)

if [ $str1 = $str2 ];then
    echo ture
else
    echo false
fi

 

for:

for i in 1 2 3 4 5
do
    echo $i
done

 

for i in `seq 1 100`
do
    echo $i
done

 

for((i=1;num<=100;num++))
do
    echo $num
done

 

 

while:

while((i<=10))
do
    echo $i
    ((i++))
done

until:

until [ ! $i -lt 10 ]
do
    echo $i
    ((i++))
done

 

case:

case $num in
    1)echo num is 1
    ;;
    2)echo num is 2
    ;;
    *)echo num is other
    ;;
esac

 

函数:

func(){
    echo "$1 $2"
}
func hello world

 

脚本调用:

. 1.sh


source 1.sh