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Reverse DNS from command line

Quick and easy way to look up a domain name given an IP address.

dig -x 17.254.3.183


Search for open files that won't allow you to unmount a server volume

lsof | grep "Office Server"

Lists out all open files on a given volume ("Office Server" in this case.) Good to find those peskey open files that won't let you eject a mounted network volume.

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