linux - 如何打印数组的所有偶数位置？

Question

我想用 bash launch_script_even.sh one two three four five six seven eight 执行 Bash 脚本。需要输入 one two three four five six seven eight在数组中并仅打印 two four six eight .(数组的偶数位置)

控制台中的结果:

Launch_script_even
arguments:8
two four six eight

echo "name of script is $0"
echo "arguments:$#"
echo "$@"
echo "...

Answer 1

获取请求结果的解决方案

命名脚本:launch_script_even

#!/bin/bash
echo "name of script is $0"
echo "arguments:$#"
args=("$@")
for (( i=1; i<=$#; i++ )); do          
    if (( i % 2 == 0 )); then
        echo ${args[$i - 1]}
    fi
done

调用:bash launch_script_even 一二三四五六七八

结果:

name of script is launch_script_even.sh
arguments:8
two
four
six
eight