a command/script for replacing a word with another
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Your example is the most basic use of this very powerful command.
Here's the general form:
sed 's/oldword/newword/g' <oldfile >newfile
This reads from oldfile and replaces ALL occurences of oldword with newword. It then writes to newfile.
You are now standing on the tip of a very large iceberg---here is the best tutorial on sed that I have ever seen: http://www.grymoire.com/Unix/Sed.html
If you need to include shell variable in the patterns, use double quotes. You can use pretty much any character as the pattern delimiter, the first character after the 's' is taken to be the delimiter. To use the delimiter character in a pattern prefix it with a backslash - you can write some pretty confusing patterns this way!
I don't generally keep track of links like this--it is so much easier to get it thru Google.
Let's say you search some "sed" examples. You will find through Google the same few simple examples on almost every site. This becomes annoying after a time. That's why I like to have bookmarks, links where you find everything, or at least a lot of documentation. I made a bookmark for sed and awk on that site and I'm pretty sure I will never lose time searching for these 2.