Changing all file's extensions in a folder using CLI in Linux

Question

How to change all file's extensions in a folder using one command on CLI in Linux?

Answer 1

Use rename:

rename 's/.old$/.new/' *.old

Answer 2

If you have the perl rename installed (there are different rename implementations) you can do something like this:

$ ls -1
test1.foo
test2.foo
test3.foo

$ rename 's/\.foo$/.bar/' *.foo

$ ls -1
test1.bar
test2.bar
test3.bar

Answer 3

You could use a for-loop on the command line:

for foo in *.old; do mv $foo `basename $foo .old`.new; done

this will take all files with extension .old and rename them to .new

Answer 4

This should works on current directory AND sub-directories. It will rename all .oldExtension files under directory structure with a new extension.

for f in `find . -iname '*.oldExtension' -type f -print`;do mv "$f" ${f%.oldExtension}.newExtension; done

Answer 5

This will work recursively, and with files containing spaces.
Be sure to replace .old and .new with the proper extensions before running.

find . -iname '*.old' -type f -exec bash -c 'mv "$0" "${0%.old}.new"' {} \;

Answer 6

Source : recursively add file extension to all files (Not my answer.)

find . -type f -exec mv '{}' '{}'.jpg \;

Explanation: this recursively finds all files (-type f) starting from the current directory (.) and applies the move command (mv) to each of them. Note also the quotes around {}, so that filenames with spaces (and even newlines...) are properly handled.