Question

我有一个bash脚本，用于检查输入日期（$ 1）是否属于某个范围/日期范围。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

我不知道如何将关联数组复制到dict变量。样本用法

$ ./script.sh 20170707 a

  20170707 falls in the range of a

Answer 1

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是ksh93功能nameref的bash（4.3+）版本;见http://wiki.bash-hackers.org/commands/builtin/declare#nameref

关联数组名称替换和复制bash

1 个答案: