AWS S3 bucket names

aws_s3_bucket_names.sh

#!/usr/bin/env bash

# get a list of S3 bucket names
# -----------------------------
# aws returns the bucket creation date and name:
# 2022-02-22 22:22:22 bucket-name
# additional logic is required to produce an array of names.

# pure bash
# https://github.com/dylanaraps/pure-bash-bible/issues/113
# "read returns 1 when everything is read, which is convenient when used in a while loop"
BUCKETS="$(aws s3 ls)"
IFS=$'\n' read -d "" -ra BUCKETS_ARRAY <<<"$BUCKETS" || true
for i in "${!BUCKETS_ARRAY[@]}"; do
  BUCKETS_ARRAY[i]="${BUCKETS_ARRAY[i]##* }"
done

echo ${#BUCKETS[@]}       # 1
echo ${#BUCKETS_ARRAY[@]} # number of buckets

# pure bash 4+ using mapfile
# https://github.com/dylanaraps/pure-bash-bible/issues/38
BUCKETS="$(aws s3 ls)"
mapfile BUCKETS_ARRAY <<<"$BUCKETS"
for i in "${!BUCKETS_ARRAY[@]}"; do
  BUCKETS_ARRAY[i]="${BUCKETS_ARRAY[i]##* }"
done

echo ${#BUCKETS[@]}       # 1
echo ${#BUCKETS_ARRAY[@]} # number of buckets

# bash 4+ using mapfile with cut
BUCKETS="$(aws s3 ls | cut -d ' ' -f 3)"
mapfile BUCKETS_ARRAY <<<"$BUCKETS"

echo ${#BUCKETS[@]}       # 1
echo ${#BUCKETS_ARRAY[@]} # number of buckets