从数组选择随机项目 [英] Select a random item from an array

问题描述

我在Shell脚本创建一个机器人：

I'm creating a bot in Shell Script:

# Array with expressions
expressions=("Ploink Poink" "I Need Oil" "Some Bytes are Missing!" "Poink Poink" "Piiiip Beeeep!!" "Hello" "Whoops! I'm out of memmory!")

# Seed random generator
RANDOM=$$$(date +%s)

# Loop loop loop loop loop loop ...
while [ 1 ]
do
    # Get random expression...
    selectedexpression=${expressions[$RANDOM % ${#RANDOM[*]}]}

    # Write to Shell
    echo $selectedexpression


    # Wait an half hour
    sleep 1 # It's one second for debugging, dear SOers
done

我想它打印从前pressions 每秒随机项。我试过，但它不工作。只打印第一个（Ploink Poink）每次。任何人都可以帮我吗？
谢谢

I want that it prints a random item from the expressions every second. I tried this but it does not work. It only prints the first one (Ploink Poink) every time. Can anyone help me out? Thanks

推荐答案

更改，可以定义selectedex pression到线

Change the line where you define selectedexpression to

selectedex pression = $ {EX pressions [$ RANDOM％$ {＃前pressions [@]}] }

您希望您的索引到前pression是一个随机数从0到EX pression数组的长度。这将这样做。

You want your index into expression to be a random number from 0 to the length of the expression array. This will do that.

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