There are some commands which filter or act on input, and then pass it along as output, I think usually to stdout - but some commands will just take the stdin and do whatever they do with it, and output nothing.I'm most familiar with OS X and so there are two that come to mind immediately are pbcopy and pbpaste- which are means of accessing the system clipboard.Anyhow, I know that if I want to take stdout and spit the output to go to both stdout and a file then I can use the tee command. And I know a little about xargs, but I don't think that's what I'm looking for.I want to know how I can split stdout to go between two (or more) commands. For example:cat file.txt | stdout-split -c1 pbcopy -c2 grep -i errorsThere is probably a better example than that one, but I really am interested in knowing how I can send stdout to a command that does not relay it and while keeping stdout from being muted - I'm not asking about how to cat a file and grep part of it and copy it to the clipboard - the specific commands are not that important.Also - I'm not asking how to send this to a file and stdout - this may be a duplicate question (sorry) but I did some looking and could only find similar ones that were asking about how to split between stdout and a file - and the answers to those questions seemed to be tee, which I don't think will work for me.Finally, you may ask why not just make pbcopy the last thing in the pipe chain? and my response is 1) what if I want to use it and still see the output in the console? 2) what if I want to use two commands which do not output stdout after they process the input?Oh, and one more thing - I realize I could use tee and a named pipe (mkfifo) but I was hoping for a way this could be done inline, concisely, without a prior setup :)
How can I send stdout to multiple commands?
shell;command line;io redirection
You can use tee and process substitution for this:cat file.txt | tee >(pbcopy) | grep errorsThis will send all the output of cat file.txt to pbcopy, and you'll only get the result of grep on your console.You can put multiple processes in the tee part:cat file.txt | tee >(pbcopy) >(do_stuff) >(do_more_stuff) | grep errors