Linux 'bash -c' 有什么作用？
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What does 'bash -c' do?
提问by giannisapi
I followed the following tutorial: http://davidtsadler.com/archives/2012/06/03/how-to-install-magento-on-ubuntu/
我遵循以下教程：http: //davidtsadler.com/archives/2012/06/03/how-to-install-magento-on-ubuntu/
At some point it told me to execute the following command:
在某些时候它告诉我执行以下命令：
sudo bash -c "cat >> /etc/apache2/sites-available/magento-store.com <<EOF
<VirtualHost *:80>
ServerName localhost.magento-store.com
ServerAlias www.localhost.magento-store.com
DocumentRoot /home/dev/public_html/magento-store.com/public
LogLevel warn
ErrorLog /home/dev/public_html/magento-store.com/log/error.log
CustomLog /home/dev/public_html/magento-store.com/log/access.log combined
</VirtualHost>
EOF"
What did this command do, and how I can cancel that?
这个命令做了什么，我如何取消它？
I restarted the computer, and it seems that it is still running. I looked in .bashrcand .profile, but I did not find it inside.
我重新启动了计算机，它似乎仍在运行。我看着.bashrc和.profile，但我没有里面找到它。
采纳答案by devnull
Quoting from man bash:
引自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 -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 ##代码##.
.
The command quoted by you would appendthe text in heredoc (i.e. the text in VirtualHosttag) to the file /etc/apache2/sites-available/magento-store.com.
您引用的命令会将heredoc 中的文本（即标签中的文本）附加VirtualHost到文件中/etc/apache2/sites-available/magento-store.com。
回答by lightandlight
The manual page for Bash(e.g. man bash) says that the -coption executes the commands from a string; i.e. everything inside the quotes.
Bash 的手册页（例如man bash）说该-c选项从字符串执行命令；即引号内的所有内容。
