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How do I split a file into many parts but with different amounts of lines per part? I looked at the split command but that only splits evenly.

I'd like a range specified to determine how many...

How do I remove non-printable characters from all txt files and output the results to one file?

I've tried the following:
tr -cd '[:print:]\n' < *.txt > out.txt
and it gives ambiguous redirect...

Thanks. Seems like awk is easier for this task. :)

How can I delete lines that contain 3 or more words?
I have a file, old.txt, that has multi-word phrases in it and I want to remove the lines with 3 words or more and send the output to new.txt.
...