関連ワード:  check if variable is empty in bash script    check if variable is empty in shell script    check if variable is null in shell script    check if variable is not empty in shell script    check if variable is null bash script    check if variable is null or empty in shell script    bash script check if variable is empty string    if condition to check if variable is not empty in shell script    bash script check if var is empty    how to check if variable value is null in shell script  
結果 : check if variable is empty in bash script