How to reference the output of the previous command twice in Linux command?

Question

For instance, if I'd like to reference the output of the previous command once, I can use the command below:

ls *.txt | xargs -I % ls -l %

But how to reference the output twice? Like how can I implement something like:

ls *.txt | xargs -I % 'some command' % > %

PS: I know how to do it in shell script, but I just want a simpler way to do it.

Answer 1

You can pass this argument to bash -c:

ls *.txt | xargs -I % bash -c 'ls -l "$1" > "out.$1"' - %