Today I Learned is an open-source project by Hashrocket that exists to catalogue the sharing & accumulation of knowledge as it happens day-to-day. Posts have a 200-word limit, and posting is open to any Rocketeer as well as selected friends of Hashrocket. We hope you enjoy learning along with us.
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When using the cp command to copy files, you can use the -n flag to make sure that you do not overwrite existing files.

Today I Learned

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