Shell解释语言，脚本语言，有多个版本

1，echo

arg1=$1

arg2=$2

echo 'arg1'$arg1

echo arg2 is

echo $arg2

2，读参数

arg1=$1

arg2=$2

echo 'arg1'$arg1

echo arg2 is

echo $arg2

3.for语句

#declare a

for a in 1 2 3 

do

echo $a

done

----

for day in Monday Wednesday Firday Sunday; do echo $day ; done

4，while语句

declare b=2

while test $b -gt 0

do 

echo $b

let b=$b-1

done

while [ $b -lt 2 ]

do 

echo $b

((b++))

done