Write a robust zsh script with arrays, associative arrays, and strict error handling for system administration tasks

Steps

1. Start with #!/usr/bin/env zsh and enable strict mode: setopt ERR_EXIT PIPE_FAIL NOUNSET
2. Declare an indexed array: local -a files=(); files+=("file1.txt" "file2.txt"); iterate with: for f in ${files[@]}; do echo $f; done
3. Declare an associative array (requires zsh 4+): local -A config; config[host]='localhost'; config[port]='5432'; access a value: echo ${config[host]}
4. Use zsh-specific parameter expansion: ${VAR:=default} to assign if unset, ${(U)VAR} to uppercase, ${#array} for array length.
5. Trap cleanup on exit: trap 'echo cleanup' EXIT — zsh EXIT trap fires on normal exit, error exit, and signal termination.