如何在这种bash单行代码中实现并行性

Question

有人可以帮我整理一下这个肮脏的单行代码并实现并行性吗？

find . -name "*.php" -exec rename 's/\.php$/.txt/' '{}' \; && chown www-data:www-data -R * && chmod 0755 -R * && find . -name "*.html" -exec rename 's/\.html$/.txt/' '{}' \; && find . -name ".htaccess" -delete

Answer 1

Adding parallelism to an I/O bound set of tasks will only make it slower if the parallel tasks share the same I/O channel. (Hint: they do here.)

The only useful optimization you can do here is reduce the number of times you traverse the same directory tree.

find . -exec chown www-data:www-data {} \; \
  -exec chmod 0755 {} \; \
  \( -name "*.php" -exec rename 's/\.php$/.txt/' '{}' \; \
  -o -name "*.html" -exec rename 's/\.html$/.txt/' '{}' \; \
  -o -name ".htaccess" -delete \)

This could still be tweaked but eg avoiding to chown a file you know you are going to delete is small potatoes compared to reducing five directory traversals to one.