我需要在 bash 中多维数组，我自己编写了一个函数，但它太慢了，
是否有一个库可以更快地访问数组。
为了在父数组中创建 1000 个子数组条目，然后读出子数组的第一个元素，整个过程，
我需要 0.157s
time { for ((i=0;i<1000;i++)); do arrOFarr test create $i "ab ab ab ab ab ab ab ab ab ab ab ab ab"; done; for index in ${!test_arrOFarr[*]}; do arrOFarr test get $index; echo $arrOFarr_item; done }
我有这个功能：
#!/bin/bash
#-- call: arrOFarr [array basename STR] [action STR] [index INT] [action additional argument STR or bINT]
#-- description: allows arrays of arrays as items. the parent array is an indexed array, the child array can be an associative or indexed array.
#-- parameters: $1 ... array basename STR - the basename of the parent array, the array is set in the shell parameters with "_arrOFarr" addition to the basename
# created items (child arrays) of the parent array are set with "_arrOFarr_item_"(unique number) addition
#-- $2 ... action STR - the type of action
#-- In the following examples test is the basename of the parent array and so it is set in shell parameters as "test_arrOFarr"
#-- create ... creates an indexed array, with the item string, overhanded as action argument
#-- and adds it to the parent array at index position. If the parent array doesnt exists yet, it will be created!
#--
#-- arrOFarr test create 0 "hello bello cello dello" unquoted items
#-- arrOFarr test create 1 '"hello" "bello" "*" "?"' quoted items - prohibit file globbing
#-- $varname="hello_bello_cello"; IFS="_" arrOFarr test create 2 '$varname' items by word splitting
#--
#-- the indexed array are set in the shell parameters as "test_arrOFarr_item_"(unique number)
#-- Attention: if word splitting is used, use set -o noglob to prohibit that data characters * ? [] are recognized as file patterns,
#-- if these characters are in the action argument.
#--
#-- add ... adds an already existing associative or indexed array to the parent array at index position, the variable name is overhanded in the action argument
#--
#-- x=(ab bb bc); arrOFarr test add 3 x
#--
#-- get ... gets the items of the parent array at index position, the child_array is finally linked under shell parameter "arrOFarr_item" !!!!
#-- arrOFarr test get 0 -- gets the item with index 0
#--
#-- unset ... unsets the item of the parent array at index position and unsets the linked child array in the shell parameters
#-- or if index "-" unsets the complete arrOFarr parent array and its child arrays in the shell parameters
#-- arrOFarr test unset 0 -- unsets an item of the parent array
#-- arrOFarr test unset - -- kills complete arrOFarr parent array
#--
#-- rewrite ... rewrites the parent array, removing empty places in the array
#-- arrOFarr rewrite
#--
#-- $3 ... index INT - the array index of the parent array for the action
#--
#-- $4 ... action argument
#-- create - STR ... the item string of the created indexed array - "hello bello cello dello" - examples see create
#-- add - STR ... the variable name of the associative or indexed array to add
#-- get - not needed
#-- unset - not needed
#-- rewrite - not needed
#-- depends on: -
arrOFarr ()
{
#-- example array basename is test
local arrOFarr_varname="${1}_arrOFarr"
local -n arrOFarr_isSet="${arrOFarr_varname}_isSet"
#-- check if arrOFarr is set, if not set it
if ((${#arrOFarr_isSet}==0)); then
declare -ga "${arrOFarr_varname}=()" #--added as test_arrOFarr to shell parameters
declare -g "${arrOFarr_varname}_unique_counter=0" "${arrOFarr_varname}_isSet=true" #--added as test_arrOFarr_unique_counter, test_arrOFarr_isSet to shell parameters
fi
local -n arrOFarr=$arrOFarr_varname arrOFarr_unique_counter="${arrOFarr_varname}_unique_counter" #-- link the variables, arrOFarr ... parent array, arrOFarr_unique_counter ... as unique id for the name of child arrays
local arrOFarr_childarray_basename="${arrOFarr_varname}_item_" #-- becomes test_arrOFarr_item_
case $2 in
"create")
arrOFarr_varname=$arrOFarr_childarray_basename$arrOFarr_unique_counter #-- arrOFarr varname redefined to child array varname,
declare -ga "$arrOFarr_varname=($4)" #-- child array added as test_arrOFarr_item_(uniqueID) to shell parameters
arrOFarr[$3]=$arrOFarr_varname #-- the child array variabel name is set as item in the parent array
((arrOFarr_unique_counter++));;
"add")
arrOFarr[$3]=$4;; #-- adds an existing associative or indexed array to the parent array
"get")
declare -gn arrOFarr_item=${arrOFarr[$3]};; #-- links the child array to shell parameter arrOFarr_item
"unset")
if [[ $3 == "-" ]]; then
unset "${arrOFarr[@]}" arrOFarr arrOFarr_unique_counter arrOFarr_isSet #-- unsets the complete parent array
else
unset ${arrOFarr[$3]} arrOFarr[$3] #-- unsets the child array in the shell parameters and unsets the name of the child array in the parent array
fi;;
"rewrite")
arrOFarr=("${arrOFarr[@]}");; #-- rewrites the array killing empty indices
esac
}