bash 将 for 循环的输出存储到数组或变量中
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Store output of for loop into an array or variable
提问by zozo6015
I have a for loop as shown below. I need the whole output of the loop added into an array or variable.
我有一个 for 循环，如下所示。我需要将循环的整个输出添加到数组或变量中。
for i in $ip
do
curl -s $i:9200
done
Any idea how I can achieve that?
知道我如何实现这一目标吗？
回答by anubhava
You can use it like this:
你可以这样使用它：
# declare an array
declare -a arr=()
for i in $ip
do
# append each curl output into our array
arr+=( "$(curl -s $i:9200)" )
done
# check array content
declare -p arr
It is important to use quotes around curl comment to avoid splitting words of curlcommand's output into multiple array entries. With quotes all of the curl output will become a single entry in the array.
在 curl 注释周围使用引号很重要，以避免将curl命令输出的单词拆分为多个数组条目。使用引号，所有 curl 输出将成为数组中的单个条目。
回答by Richard Hamilton
You can use +=
您可以使用 +=
declare -a output
for i in $ip
do
output+=("$(curl -s $i:9200)")
done
回答by John Bollinger
You can capture the output of any command, including a compound command, by enclosing it in $(). Using that technique, you can capture the output of your forloop in a variable like so:
您可以捕获任何命令的输出，包括复合命令，将其包含在$(). 使用该技术，您可以for在变量中捕获循环的输出，如下所示：
results=$(
for i in $ip
do
curl -s $i:9200
done
)
In principle, capturing into an array can be done in similar fashion, but handling element delimiters appropriately could prove difficult.
原则上，可以以类似的方式捕获到数组中，但适当地处理元素分隔符可能会被证明是困难的。
