linux - 将数组元素传递给 Heredoc

Question

我正在尝试将一个数组元素传递给 heredoc，目标是生成一个文件，例如:

declare -a box=("element1" "element2" "element3")

cat > test.txt <<-EOF
some text, insert first element
some text, insert second element
some text, insert third element
EOF

这可能吗？我该如何实现？

Answer 1

您可以使用 $(..) 嵌套循环:

declare -a box=("element1" "element2" "element3")

cat > test.txt <<-EOF
Greetings,

Here are the elements you wanted:
$(
    for s in "${box[@]}"
    do
      echo "some text, $s"
    done
 )

Happy New Year from $USER
EOF

执行时，会生成一个 test.txt，其中包含:

Greetings,

Here are the elements you wanted:
some text, element1
some text, element2
some text, element3

Happy New Year from myusername