Recently I generated kickstart files for a virtual environment where people could experiment and virtual machines could be rebuild quickly. Sadly enough a typo slipped into the generated files that would make the anaconda installer stop. Every kickstart file could be corrected by hand off course, but one sed command could also correct the typo in all files in one go.
$ sed -i 's/namesever/nameserver/' *.ks
The Unix toolkit is full of handy tools and options like this and it pays to get to know your environment. Specially when it is your work environment and you’re familiar with the Unix philosophy.