I have two programs: p1 and p2. I run p1 | p2. I know how to read stdout from p1 in p2 stdin. How can I do the same with stderr.
Thanks, Nicolas
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A pipe (
|) in most (or all) shells takes the stdout of a command and passes it to the second command.Taking the stderr from the first command can therefore only be done on the command line. In bash you'd do it this way:
This tells bash to forward stderr to stdout. Both are then piped to p2.
Alternatively you can make p1 print everything to stdout only.