Reading the same stdin with two commands in bash

bashpipe

I would like to pipe an output of to two separate commands <2,3> in bash. What is the best way of doing this? At the moment, I have following script:

command source > output
command2 output &
command3 output &

The output file is ~100G and a suboptimal way would be to pipe to commands 2 and 3 separately. I would think it is possible to do even more efficiently.

Best Answer

In bash: command source | tee >(command2) >(command3)

From this stackoverflow question. I haven't tried this with ginormous outputs.

Related Solutions

Launch only the command if the previous one worked inside SSH, shell

ssh -oBatchMode=yes user@hostname "mysql -u yop -pyop -c yop && echo test"

The && operator executes the second command if and only if the first one succeeds. You can read it as "and then".

By the way, if you just wanted to execute the commands sequentially, you would use a semi-colon ;, as in cmd1; cmd2. A pipe | runs two commands in parallel with stdout of the first connected to stdin of the second. Not at all what you want, in this case.

Linux – Pipe output from two commands into one

Try this instead:

$ ( grep 40515575 * && zgrep 40515575 * ) | less

Best Answer

Related Solutions

Launch only the command if the previous one worked inside SSH, shell

Linux – Pipe output from two commands into one

Related Question