bash使用数组变量创建for循环

时间:2017-01-11 13:23:57

标签: arrays bash for-loop

我试图通过for循环读取命令的输出,但是这样循环变量将是一个数组。那可能吗? 这是我到目前为止所尝试的:

function samplevals() {
    echo '"aa bb"'
    echo '"cc dd"'
    echo '"ee ff" "gg hh"'
}

samplevar='"aa bb"
"cc dd"
"ee ff" "gg hh"'

echo call function samplevals:
for x in `samplevals `; do echo ">$x<"; done

echo read variable samplevar:
echo $samplevar
for x in $samplevar; do echo ">$x<"; done

echo process output of 'echo samplevar:'
for x in `echo $samplevar`; do echo ">$x<"; done

echo "the thing with set"
for x in $samplevar; do set -- $x ; echo "\$1=>$1<,\$2=>$2<"; done

但输出始终相同:

>"aa<
>bb"<
>"cc<
>dd"<
>"ee<
>ff"<
>"gg<
>hh"<

我可以以某种方式阻止bash将元素拆分成更小的部分吗?

2 个答案:

答案 0 :(得分:1)

bash中定义数组的方法是

samplevars=("aa bb" "cc dd" "ee ff" "gg hh")
for x in "${samplevars[@]}"; do
    echo ">$x<"
done

答案 1 :(得分:1)

沿chepner's answer行,使用read命令。命令的-a标志部分允许输出写出到数组。

IFS=$'\t' read -ra arrayDef < <(echo -ne '"abc def"\t"ghi jkl"')
for x in "${arrayDef[@]}"; do
    echo ">$x<"
done

您可以使用生成此类字符串的某个命令替换echo部分。请记住适当更新IFS字符串的限制方式。就我而言,我只是将字符串限制为\t