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\frametitle{Example: Auto-Backup}
\begin{block}{A Robust Backup Script}
\begin{verbatim}
#!/bin/bash
set -euo pipefail

DEST="/backups/$(date +%Y-%m-%d)"
mkdir -p "$DEST"

for dir in "$@"; do
  if [ -d "$dir" ]; then
    echo "Backing up $dir..."
    tar -czf "$DEST/$(basename "$dir").tar.gz" "$dir"
  else
    echo "Warning: $dir is not a directory" >&2
  fi
done
\end{verbatim}
\end{block}