There's another advantage to using filters in pipelines: each part of the pipeline runs in parallel! I recently rewrote some bash code to replace for subdir

There's another advantage to using filters in pipelines: each part of the pipeline runs in parallel! I recently rewrote some bash code to replace for subdir in $names do for parent in $(parent_of $dir) do [ -d $parent/$subdir ] && … done done with parents_of $dir | append_subdirs $names | is_dir | xargs … I expected a modest speed improvement (due to not calculating the parents of a dir repeatedly), but was surprised to see it was twice as fast!