Bash snippets

snippets.sh

#!/bin/bash

# Dynamic bracket expansion
eval echo "{1..3}"
eval echo "foo-{bar,baz}-{1..3}"

# Merge JSON objects
merged="$(jq -ers '.[0] * .[1]' <(echo '{"name": "foo"}') <(echo '{"age": "baz"}') 2>/dev/null)"

# Check if string is valid JSON
if ! jq -e 'type == "object"' <<< "$string" &>/dev/null; then
  echo "Invalid payload: $payload"
  exit 1
fi

# Merge and sort array
IFS="$delimiter" read -r -a arr1 <<< "$1"
IFS="$delimiter" read -r -a arr2 <<< "$2"
# Merge and deduplicate
local merged=("${arr1[@]}" "${arr2[@]}")
# shellcheck disable=2207
merged=($(printf "%s\n" "${all[@]}" | sort -u))

# Get nth line of a file
tail -n+2 file | head -n1

# URL decode
# https://stackoverflow.com/a/37840948
urldecode() {
  : "${*//+/ }"
  echo -e "${_//%/\\x}"
}