Rename multiple file endings of the same type in Linux console

Say you want to rename all files ending with “txt” to now end with “csv”

folder structure before running the command:

Command:

folder structure after the command has been executed:

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20 years of coding and working as software engineer but I am still eager to learn more. I am very passionate when it comes to open source, Linux and Java. But I made my peace with Windows long ago to fully enjoy my PC gaming hobby. I have a soft spot for 90s electronic music and Babylon 5. In the evenings you will find me roaming the endless space in Warframe (IGN k05h).