Retrieving a Previously Deleted File in Subversion

Let’s say that you have deleted a file (or directory) in your checked out copy of a svn repository and then checked it in (committed your change).

You discover that you really would like to have that file back in your current version of your repo. You can either us the svn merge command, or copy the file from a previous version of your repo.

Here is how you can copy the file from a previous version:

svn rm blah.txt
svn commit blah.txt -m “removed blah.txt”

(now you are at version 15)
Make a number of other commits/changes, and now you want blah.txt back from version 14.

svn cp url/to/repo/blah.txt -r14 blah.txt
svn commit blah.txt -m “retrieved blah.txt from r14”

Setting up Proxy Authentication for a Linux Box to use yum

Should you find yourself running a Linux box behind a proxy that requires authentication you will need to update your setup so that you can get access to the outside world, and make some configuration changes to yum.

First, add the following to your /etc/yum.conf (note, this is incredibly insecure as you will now have your proxy uid and password in clear text on your machine. You should remove your login details after you have made your connections):

proxy=http://proxy_url:80
proxy_username=uid
proxy_password=passwd

Secondly, if you want to have access to the outside world for other processes you’ll need to edit your .bash_profile and add the following (again, this is really insecure):

http_proxy=http://uid:password@proxy.url.com:80

source your .bash_profile and now you should be able to authenticate to the proxy server.