関連ワード:  bash check if variable defined and not empty    bash check if variable exists and not empty    bash check if variable set and not empty    bash check if var is defined and not empty    bash check if environment variable exists and not empty    shell check if variable is set and not empty    bash check if environment variable is set and not empty    bash check if variable exists or is empty    shell check if variable is not empty    shell check if variable is empty  
結果 : bash check if variable defined and not empty