So it's a little bash script I wrote to help quickly update SSH config files. I found that I was frequently vim'ing and grepping my config for the names of servers I didn't use very often. This script is an attempt to speed up those interactions.
I added the removal ability because I wanted to have a play with sed and see what could be done.
Usage is probably best by alias, pull the code and alias to script. e.g from my bash_profile:
alias scu='/path/to/repo/ssh_config_updater.sh'
Then invocation is simply $ scu
By default the script will run in interactive mode, however this is not always useful and there is the options for some command line args.
-l will list all entries in the config file
This script has been written for bash and developed and tested on OS X. I will test it on more platforms if it becomes more useful but I use sed to process the removal which might not translate. You'll have to try for yourself.