考虑下面的关联数组:
declare -A shapingTimes
shapingTimes=([0-start]=15 [0-stop]=21 [0-anotherkey]=foo)
shapingTimes+=([1-start]=4 [1-stop]=6 [1-anotherkey]=bar)
shapingTimes+=([2-start]=9 [2-stop]=11 [2-anotherkey]=blah)
有没有办法找到数组中每个条目使用的键总数? (这是数组中的每个“索引”吗?)例如,如何将:[start], [stop], [anotherkey] 计算为= 3 个键?
目前,我正在使用此代码中的硬编码值 (3),我发现(如下所示)可以很好地完成工作,但我想知道这是否可以动态实现?
totalshapingTimes=$((${#shapingTimes[*]} / 3))
我发现这些变量返回数组的各个方面,但不是键的总数。echo "All of the items in the array:" ${shapingTimes[*]}
echo "All of the indexes in the array:" ${!shapingTimes[*]}
echo "Total number of items in the array:" ${#shapingTimes[*]}
echo "Total number of KEYS in each array entry:" #???
所需输出:All of the items in the array: 21 6 11 blah 15 4 bar 9 foo
All of the indexes in the array: 0-stop 1-stop 2-stop 2-anotherkey 0-start 1-start 1-anotherkey 2-start 0-anotherkey
Total number of items in the array: 9
Total number of KEYS in each array entry: 3
最佳答案
declare -A shapingTimes
shapingTimes=([0-start]=15 [0-stop]=21 [0-anotherkey]=foo)
shapingTimes+=([1-start]=4 [1-stop]=6 [1-anotherkey]=bar)
shapingTimes+=([2-start]=9 [2-stop]=11 [2-anotherkey]=blah)
# output all keys
for i in "${!shapingTimes[@]}"; do echo $i; done
输出:1-start 2-stop 1-stop 0-start 2-start 2-anotherkey 1-anotherkey 0-stop 0-anotherkey
# Leading numbers and "-" removed:
for i in "${!shapingTimes[@]}"; do echo ${i/#[0-9]*-/}; done
输出:start stop stop start start anotherkey anotherkey stop anotherkey
# put shortend keys in new associative array
declare -A hash
for i in "${!shapingTimes[@]}"; do hash[${i/#[0-9]*-/}]=""; done
echo "${#hash[@]}"
输出:3
关于arrays - Bash:计算关联数组中键的总数?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/63532910/