擅长:python、mysql、java
<p><a href="https://stackoverflow.com/questions/3224878/what-is-the-purpose-of-the-colon-gnu-bash-builtin">What is the purpose of the : (colon) GNU Bash builtin?</a></p>
<p>另外,一旦调用exec,其余的代码就不会被执行,因为exec用程序(在本例中是python进程)替换shell。(<a href="http://wiki.bash-hackers.org/commands/builtin/exec" rel="nofollow noreferrer">http://wiki.bash-hackers.org/commands/builtin/exec</a>)</p>