Arrays in Bash

Real lists, if you quote them right.

langs=(bash python rust)
langs+=(go)

echo "count: ${#langs[@]}"
echo "first: ${langs[0]}, last: ${langs[-1]}"

# "${arr[@]}" expands one word per element -- the quoting matters
for lang in "${langs[@]}"; do
    echo "- $lang"
done

How it works

(a b c) builds; += appends; ${#langs[@]} counts.
[-1] reads from the end.
"${langs[@]}" expands one word per element — the quotes matter.

Keywords and builtins used here

do
done
echo
for
in

The run, in numbers

Lines: 10
Characters to type: 227
Tokens: 51
Three-star pace: 75 tpm

At the three-star pace of 75 tokens a minute, this run takes about 41 seconds.

Type this snippet

Step 1 of 3 in Arrays, step 10 of 26 in Language basics.

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Arrays in other languages