Make a Bunch of Fake Files

I have a bunch of fake files used for testing.

$ ls
foo.bar      foo.ipynb    foo.jpg      foo.json     foo.numbers  foo.py       foo.txt      foo.zip
foo.csv      foo.jpeg     foo.js       foo.log      foo.png      foo.tiff     foo.xlsx

I want a bunch more with different names.

ls | sed 's/foo/bar/' | xargs touch

Now I have more.

$ ls
bar.bar      bar.jpeg     bar.json     bar.png      bar.txt      foo.bar      foo.jpeg     foo.json     foo.png      foo.txt
bar.csv      bar.jpg      bar.log      bar.py       bar.xlsx     foo.csv      foo.jpg      foo.log      foo.py       foo.xlsx
bar.ipynb    bar.js       bar.numbers  bar.tiff     bar.zip      foo.ipynb    foo.js       foo.numbers  foo.tiff     foo.zip