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Also, '< file.txt | ...' does not work as well. Not sure if its well researched.

• egwynn 8y ago
  Yeah my eyebrow went up at that one too…
• ben509 8y ago
  Which is surprising since "research" here means pasting it into a terminal... Maybe they meant `cat file.txt | while ...`? Even then, you never want to do that when you're reading because elements of a pipeline are run in subshells. The usual idiom is: while cond; do thing done < input > output It's also the problem with cheatsheets: the underlying idea in bash is that compound statements are like mini programs, so they have file handles that can be redirected. That doesn't come through a cheatsheet very well.