How to use sed to change file extensions?

Question

I have to do a sed line (also using pipes in Linux) to change a file extension, so I can do some kind of mv *.1stextension *.2ndextension like mv *.txt *.

Answer 1

You may try following options

Option 1 find along with rename

find . -type f -name "*.ext1" -exec rename -f 's/\.ext1$/ext2/' {} \;

Option 2 find along with mv

find . -type f -name "*.ext1" -exec sh -c 'mv -f $0 ${0%.ext1}.ext2' {} \;

Note: It is observed that rename doesn't work for many terminals