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how to use echo or printf with xargs to iterate over a list from a file?
In poking about with xargs, as here:
nicholas@gondor:~/x$
nicholas@gondor:~/x$ xargs echo < list.txt
1 2 3
nicholas@gondor:~/x$
nicholas@gondor:~/x$ cat list.txt
1
2
3
nicholas@gondor:~/x$
how ...
