UNIX / Linux: HowTo Use unison File Synchronizer

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I know how to use rsync for Unix systems which synchronizes files and directories from one location to another while minimizing data transfer. However, I would like to synchronizing files between two directories, either on one computer, or between a computer and another server. How do I maintain the same version of files on multiple servers?

Linux / UNIX FTP Commands Tutorial

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I switched from MS-Windows to Mac computer running OS X UNIX systems. I need to transfer and download file using ftp for my personal website. Can you provide me a list of FTP commands that may be sent to an FTP server, to upload and download files using UNIX / Linux ftp command line client?

Delete SSH Keys

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One my user leaves the office and I’d like to disable her access to our UNIX / Linux system. How do I delete ssh key from the UNIX systems so that user can not log in?