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lang-bash
cat <(curl http://url.tld/file.sh)outputs file contents,cp <(curl http://url.tld/file.sh) /new/destcopies the file, andsource <(curl http://url.tld/file.sh)fails.bashversions’sourcebuiltin react differently to being passed a file descriptor through process substitution (AFAIK Ubuntu has been usingbash4 since 2010). Rephrased my answer to narrow down the specifics.