关联数组名称替换和复制bash

I have a bash script which checks if the input date($1) falls in a range/ranges of dates. User inputs a date and (a or b, which is $2).

我有一个bash脚本,它检查输入日期($ 1)是否属于日期范围/范围。用户输入日期和(a或b,即$ 2)。

#!/usr/bin/env bash

today=$(date +"%Y%M%d")
declare -A dict=$2_range
a_range=( ["20140602"]="20151222" ["20170201"]="$today" )
b_range=( ["20140602"]="20150130" )

for key in ${!dict[@]}; do
  if [[ $1 -le ${dict[$key]} ]] && [[ $1 -ge $key ]]; then
    echo $1 falls in the range of $2
  fi
done

I do not know how to copy the associative array to the dict variable. Sample usage

我不知道如何将关联数组复制到dict变量。样品用法

$ ./script.sh 20170707 a

  20170707 falls in the range of a

1 个解决方案

#1

You don't need to copy anything at all; you just need an alias.

你根本不需要复制任何东西;你只需要一个别名。

#!/usr/bin/env bash

today=$(date +"%Y%M%d")

# you need declare -A **before** data is given.
# previously, these were sparse indexed arrays, not associative arrays at all.
declare -A a_range=( ["20140602"]="20151222" ["20170201"]="$today" )
declare -A b_range=( ["20140602"]="20150130" )

# declare -n makes dict a reference to (not a copy of) your named range.
declare -n dict="$2_range"

for key in "${!dict[@]}"; do
  if (( $1 <= ${dict[$key]} )) && (( $1 >= key )); then
    echo "$1 falls in the range of $2"
  fi
done

declare -n is the bash (4.3+) version of the ksh93 feature nameref; see http://wiki.bash-hackers.org/commands/builtin/declare#nameref

declare -n是ksh93特性nameref的bash(4.3+)版本;请参阅http://wiki.bash-hackers.org/commands/builtin/declare#nameref

#1