I was trying to change a bunch of files extensions from yml to yaml, and I've found a very good answer here in Stackoverflow. Based on that answer which was:
for file in *.yml
do
mv "$file" "${file%.yml}.yaml"
done
I've turned it into a command to make my life easier, which I've tried to share there as a comment, but since it required me 50 points to add a comment, I couldn't, then I decided to create this question as a kind of post. How can we convert that answer into a command:
Create the file chgext to add the script
vi chgext
Copy and paste the script below into the chgext file
#!/bin/bash
for file in *.$1
do
mv "$file" "${file%.$1}.$2"
done
Save and exit pressing: esc + : + x + enter
Make chgext executable
chmod +x chgext
Move it to /usr/local/bin so it can be called from any directory as any other linux command
sudo mv chgext /usr/local/bin
Now you are ready to go, call chgext passing old_extension and new_extension as params, like this from the directory where your files are
chgext yml yaml
The original answer is here