重置数组并用 bash 脚本中的值填充它
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Resetting an array and filling it with values in a bash script
提问by Alex
I wanted to know the "right" way to do this. Basically, I have a list of files that are in an array called current. This is declared as a global variable that looks like this: current=(). I have successfully put all the files in this array. But now, I am going through and parsing arguments to filter out these files and directories.
我想知道这样做的“正确”方法。基本上，我有一个名为current. 这被声明为一个全局变量，看起来像这样：current=()。我已成功将所有文件放入此数组中。但是现在，我正在通过解析参数来过滤掉这些文件和目录。
For example, to implement the -name '*.pattern'command, I pass in the patternto process_name()which does this:
例如，要实现该-name '*.pattern'命令，我将传入执行此操作的patternto process_name()：
process_name ()
{
local new_cur=()
for i in "${current[@]}"; do
if [[ "$i" == "" ]]; then
new_cur+=("$i")
fi
done
current=( "${new_cur[@]}" )
}
After the loop finishes I want to "clear" my currentarray. Then I want to loop over the new_curarray, and basically make it equal to current, or if I can, just do something like $current = $new_cur(although I know this won't work).
循环完成后，我想“清除”我的current数组。然后我想循环遍历new_cur数组，并基本上使它等于current，或者如果可以的话，就做类似的事情$current = $new_cur（尽管我知道这行不通）。
I've tried doing this after the for loop (in process_name()), but my array currentdoesn't actually change:
我试过在 for 循环（in process_name()）之后这样做，但我的数组current实际上并没有改变：
current=( "${new_cur[@]}" )
Is there a good way to do this? Or a right way to do this?
有没有好的方法可以做到这一点？或者正确的方法来做到这一点？
采纳答案by pynexj
You can simply clone an array using array1=( "${array2[@]}" ). For example:
您可以简单地使用array1=( "${array2[@]}" ). 例如：
[STEP 100] $ echo $BASH_VERSION
4.3.33(1)-release
[STEP 101] $ cat foo.sh
current=(aa bb cc)
process_name ()
{
local new_cur=()
for i in "${current[@]}"; do
if [[ "$i" == "" ]]; then
new_cur+=("$i")
fi
done
current=( "${new_cur[@]}" )
}
process_name aa
for i in "${current[@]}"; do
printf '%s\n' "$i"
done
[STEP 102] $ bash foo.sh
aa
[STEP 103] $
回答by anubhava
To reset an array just use:
要重置数组，只需使用：
current=()
This will delete old entries and declare a 0 element array.
这将删除旧条目并声明一个 0 元素数组。
