Reason is I want to make a tidy script instead of
cd /some/dir cpio -whatever<somefile cd -
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There is nothing in GNU cpio to allow for this. This might be a little cleaner:
(cd /some/dir && cpio -whatever < /some/file)
Using the subshell parentheses will preserve the scripts current working directory and using && will ensure that the cpio extraction is only done if you successfully change directories to the target.