'bash -c'是做什么的？

引用自

man bash

   -c string If the -c option is present,  then  commands  are  read  from  string.   If  there  are arguments after the string, they are  assigned to the positional parameters, starting with $0.

您引用的命令会将heredoc中的文本（即，标记中的文本） 附加

VirtualHost

/etc/apache2/sites-available/magento-store.com