linux while循环
while循环的格式[*] while expression
[*] do
[*] command
[*] command
[*] ```
[*] done
1、计数器控制的while循环
[*] #!/bin/sh
[*] int=1
[*] while(( $int<=5 ))
[*] do
[*] echo $int
[*] let "int++"
[*] done
2、结束标记控制的while循环
[*] #用脚本演示使用结束标记控制while循环实现猜1～10内的数
[*] #!/bin/sh
[*] echo "Please input the num (1~~10): "
[*] read num
[*] while [[ $num != 4 ]]
[*] do
[*] if [ $num -lt 4 ]
[*] then
[*] echo "Too small ,Try again.."
[*] read num
[*] elif [ $num -gt 4 ]
[*] then
[*] echo "Too big ,Try again.. "
[*] read num
[*] else
[*] exit 0
[*] fi
[*] done
[*] echo "Yes ,you are right !!"
3、标致控制的while循环
[*] #!/bin/sh
[*] echo "Please input the num:"
[*] read num
[*] sum=0
[*] i=1
[*] signal=0
[*] while [[ $signal != 1 ]]
[*] do
[*] if [ $i -eq $num ]
[*] then
[*] let "signal=1"
[*] let "sum+=i"
[*] echo "1+2、、、+$num=$sum"
[*] else
[*] let "sum=sum+i"
[*] let "i++"
[*] fi
[*] done
4、命令行参数控制的while循环
[*] #!/bin/sh
[*] echo "Please input arguements is $# "
[*] echo "What you input : "
[*] while [[ $* != "" ]]
[*] do
[*] echo $1
[*] shift
[*] done
[*]
页:
[1]