20.37 shell script函数如何传递数组参数

https://scz.617.cn/unix/202211161222.txt

A: scz 2022-11-16

参看《20.26 $0 ${1+"$@"}什么意思》

给BASH函数传递数组参数的幺蛾子真多，测试整理了几种方案，其他方案大概率是这 几种方案的变种。不得不说，BASH变得跟Perl一样神经病。

---

!/bin/bash

For bash 5.1.16

./arraytest.sh

Passing arrays as parameters in bash - [2009-06-30]

https://stackoverflow.com/questions/1063347/passing-arrays-as-parameters-in-bash

How to pass an array as function argument - [2015-09-15]

https://askubuntu.com/questions/60218/how-to-add-a-directory-to-the-path

How to pass an array as function argument but with other extra parameters - [2022-02-14]

https://unix.stackexchange.com/questions/690603/how-to-pass-an-array-as-function-argument-but-with-other-extra-parameters

function test_0 () { # # 甚至可以不显式引用"${@}" # # for e in "${@}" # for e do echo "${e}" done }

function test_1 () { while [ "${#}" -gt 0 ] do echo "${1}" shift 1 done }

function test_2 () { # # help declare # # 若需要indexed array，必须指定-a # local -a arr=("${@}") # # "${#arr[@]}" # local -i len="${#}" for ((i = 0; i < len; i++)) do echo "${arr[$i]}" done }

传引用，要求 bash 4.3+

function test_3 () { while [ "${#}" -gt 0 ] do local -n ref="${1}" for e in "${ref[@]}" do echo "${e}" done shift 1 done }

可传任意多个数组参数进来

function test_4 () { while [ "${#}" -gt 0 ] do # # The ! in ${!1} expands the arg 1 variable # # ${!parameter} is called indirect reference or sometimes double # referenced, this means that instead of using $1's value, we use # the value of the expanded value of $1 # for e in "${!1}" do echo "${e}" done shift done }

function test_main () { local arr_0=("1 one" "2 two" "3 three") local arr_1=("4 four") local arr_2=("5 five... 5" "6 six___ 6")

#
# 数组会被展开再传参
#
echo test_0
test_0 "${arr_0[@]}" "${arr_1[@]}" "${arr_2[@]}"
echo

echo test_1
test_1 "${arr_0[@]}" "${arr_1[@]}" "${arr_2[@]}"
echo

echo test_2
test_2 "${arr_0[@]}" "${arr_1[@]}" "${arr_2[@]}"
echo

#
# 传引用
#
echo test_3
test_3 arr_0 arr_1 arr_2
echo

#
# array are passed as names and are expanded in the function. Thus no
# $ is needed when given as parameters.
#
echo test_4
test_4 arr_0[@] arr_1[@] arr_2[@]
echo

}

test_main