Say I had a file called name.txt with the following:
white-list=true max-players=3 motd=Welcome // Version: One How would I go about finding the world One and only replacing this world with Two for example?
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2 Answers
You could use sed 's/One/Two/1' to replace one occurrence of One with Two (replace '1' with 'g' to replace every occurrence of One).
# Note the /1 makes the One to Two happen once. echo "Welcome // Version: One" | sed 's/One/Two/1' So, for a file "name.txt" you could do
cat "name.txt" | sed 's/One/Two/1' > "temp.name.txt" && mv "temp.name.txt" "name.txt" 
Comments
As a complement to the answer by Elliot Frisch, some versions of sed have a -i option to change "in place" (in fact, sed itself create the temporary file for you)
-i[SUFFIX], --in-place[=SUFFIX] edit files in place (makes backup if extension supplied)from
man sed(GNU sed version 4.2.1)
So you could simplify use the command:
sed -i 's/One/Two/' name.txt or
sed -i 's/One/Two/g' name.txt 