问题
I'm working on a server and to show detailed GPU information I use these commands:
nvidia-smi
ps -up `nvidia-smi |tail -n +16 | head -n -1 | sed 's/\s\s*/ /g' | cut -d' ' -f3`
However as you can see, nvidia-smi is called twice. How can I make the output of nvidia-smi go to output and pipe to another command at the same time?
回答1:
Use tee:
ps -up `nvidia-smi |tee /dev/stderr |tail -n +16 | head -n -1 | sed 's/\s\s*/ /g' | cut -d' ' -f3`
Since stdout is piped, you can't make a copy to it, so I picked stderr to show output.
If /dev/stderr is not available, use /proc/self/fd/2.
来源：https://stackoverflow.com/questions/50501077/how-to-output-bash-command-to-stdout-and-pipe-to-another-command-at-the-same-tim