Variables and conditions

Shell scripts gain power from strict variable handling and predictable control flow.

Recommendations

• Use set -euo pipefail for safer execution.
• Quote variables unless you explicitly need word splitting.
• Prefer [[ ... ]] over [ ... ] for conditionals.

Example

set -euo pipefail

if [[ -z "${LOG_PATH:-}" ]]; then
  echo "LOG_PATH is required" >&2
  exit 1
fi