unix/macos - how to find all files and duplicate in place with a different extension

So I want to grab all certain files then duplicate them in the same folder/location but with a different extension. So far I have this from another question Copy all files with a certain extension from all subdirectories:

find . -name *.js -exec cp newDir ;


I want to duplicate all those .js files into .ts e.g. duplicate functions.js to functions.ts wherever it may be.

.js

.ts

functions.js

functions.ts

more examples:

a/functions.js
b/test.js
c/another.js
index.js


to

a/functions.ts
b/test.ts
c/another.ts
index.ts


2 Answers
2

find . -name *.js | while read jsfile; do cp "$jsfile" "$jsfile%.js.ts"; done


find . -name *.js

.js

read

fine

$jsfile%.js

.js

jsfile

a/functions.js

a/functions

Here is how to assign variables using find and xargs and open up all sort of command-line options,

find

xargs

$ find . -name '*.js' | xargs -I bash -c 'p=""; cp $p newDir/$(basename $p%.js.ts)'


Use xargs -I to get the output of find as input to xargs. Use bash -c to execute a command.

xargs -I

find

xargs

bash -c

Here is a demo:

$ mkdir -p a b c d newDir
$ touch a/1.js b/2.js c/three.js d/something.js
$ find . -name '*.js' | xargs -I bash -c 'p=""; cp $p newDir/$(basename $p%.js.ts)'
$ ls newDir/
1.ts 2.ts something.ts three.ts


EDIT (Question changed after hours of initial post). To keep a duplicate in the same directory use the same cp command and remove newDir and basename:

cp

newDir

basename

$ find . -name '*.js' | xargs -I bash -c 'p=""; cp $p $p%.js.ts'


Thanks for contributing an answer to Stack Overflow!

But avoid …

To learn more, see our tips on writing great answers.

Required, but never shown

Required, but never shown

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.