Bash Global Array

Question

I want to have a global array, each time I call the function cal on Main, I can add a new element on array arr_var

function cal () {
# Some operation
while true; do
  read -p "would you like asignment ? on ${var} " yn
  case $yn in
    [Yy]* ) arr_var+=$var
    [Nn]* ) break;;
     * ) echo "Please answer yes or no.";;
  esac
# Some operation
done
}

# Main
eval arr_var=()
cal "aa"
cal "bb"
cal "cc"

That I want

printf '%s\n' "${arr_var[@]}"
aa bb cc

but I get

aabbcc

See: [Add a new element to an array without specifying the index in Bash](https://stackoverflow.com/q/1951506/3776858) — Cyrus, Dec 08 '21 at 18:45
@Inian, without the spaces around `+=` -- `arr_var+=( "$var" )` — glenn jackman, Dec 08 '21 at 19:27

Hizoka · Answer 1 · 2021-12-08T22:09:15.023

1

Don't use eval for that...

arr_var=()

or

declare -ag arr_var

eval is evil : Why should eval be avoided in Bash, and what should I use instead?

And you have you answer in the comments :

var=()
var+=(a)
var+=(b)
declare -p var

edited Dec 08 '21 at 22:09

answered Dec 08 '21 at 21:59

Hizoka

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Bash Global Array

1 Answers1