`wc` utility counts newline, word, and byte for file(s) or standard input.

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Number of lines outputted by ls

When ls is called, it outputs all the files/directories in the current directory, attempting to fit as many as possible on each line. Why is it that when passed to wc -l, it outputs the number of ...
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How to count the number of lines in a UTF-16LE/CR-LF/BOM file?

The immediate thought is wc, but then the next not-so-immediate thought is... Is *nix's wc purely for *nix line endings \x0a?... It seems so. I've semi-wangled my way around it, but I feel there ...
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Speeding a find rm command with test through parallelization

I want to recursively delete all files in directories and subdirectories with number of lines less than 10, and am currently using the following command find . -type f -name "*.txt" | while read; do ...