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Alex Rivera
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For this question I will use grep , because its usage text prints to stderr: $ grep Usage: grep [OPTION]... PATTERN [FILE]... Try `grep --help' for more information. You can capture stdout easily with process substitution: $ read b < <(echo hello world) However stderr slips past the process substitution and prints to the console: $ read b < <(grep) Usage: grep [OPTION]... PATTERN [FILE]... Try `grep --help' for more information. I would like to capture stderr using process substitution. I am using this now: $ grep 2> log.txt $ read b < log.txt but I am hoping to avoid the temp file.
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