如何根据wget的状态进行分支？

Question

I'm busy compiling a script to automatically install MySQL on Linux by sending a PuTTy window a number of commands.

The issue I'm having is that the download link of the one repository keeps on changing, I need to have a prompt pop up if the link is not accessible.

Here's what I got so far:

wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm 
&& echo "WE GOT IT" || echo "URL Invalid, Please specify new URL:" 
&& read newurl && wget $newurl

But on running the result regardless of if the file exists is: 1. The first file will download, it will display either echo message and then it will wait on the read newurl command for user input and then wget that new variable.

How do I make the whole second half after the "||" only occur if the first url doesn't work?

Answer 1

Refactor Your Code

Your code is too contorted. While you could improve it with braced expressions, you're much better off refactoring your logic into if/else statements. As an (untested) example:

if wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
then
    echo 'We got it!'
else
    read -p 'URL invalid. Please specify new URL: '
    wget "$REPLY"
fi

Answer 2

wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm 
&& echo "WE GOT IT" && exit || echo "URL Invalid, Please specify new URL:" 
&& read newurl && wget $newurl


Add "exit" on left side of ||  with && operator ,,if the left argument is true then it will download that file and exit from terminal otherwise prompt for new url