関連ワード:  bash if environment variable is empty    bash check if environment variable is empty    bash if environment variable is not empty    bash script check if environment variable is empty    bash test environment variable empty    shell check if env variable is empty    bash check if environment variable is not empty    shell script check if environment variable is empty    bash check if env variable is not empty    bash check if environment variable is set and not empty  
結果 : bash if environment variable is empty