In the terminal, the filename, percentage of the file copied, and the speed of the copy, and time remaining until the copy is complete are displayed as the file is copied.
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When you enter your password and press Return, the file is copied from your Macintosh to the other Macintosh. If this is your first connection to the remote computer, you will be asked to accept its SSH key. You will be prompted for your password on the computer to which you are copying. To copy a file from one Macintosh to the other using scp, you pass the utility the file you want to copy, the Macintosh you want to copy it to, and the file’s name on that computer, like so, using the Terminal application. In true Unix fashion, scp is a command-line utility. scp allows you to copy files between two Macs without mounting filesystems and incurring the overhead of the Finder dealing with another mounted filesystem. If you want to copy files or directories between two Macs, your options are burning the data to CD, swapping an external drive, personal file sharing, FTP, or scp. But you are overlooking a more mundane use of scp.
You may think that because you are copying files between machines within your own local network, you probably don’t have need for such strong security. The security in SSH comes through RSA public key cryptography. The digital certificate and passwords - and in fact the entire session - are all protected by encryption. With SSH, client and server connections are authenticated using a digital certificate and passwords. The SSH suite includes slogin, ssh, and scp for securely connecting to a remote machine, running a remote shell, and copying files to a remote machine, respectively.
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SSH is both a set of command-line utilities and a protocol for gaining access to a remote computer, already built in to the Mac OS.
A more secure means of transferring files is available using SSH, or secure shell. It sends your password and data in clear text that can easily be intercepted and viewed by malicious users. This chapter looks at a widget that demonstrates building an interface for the scp utility in Darwin.įTP may be the most familiar means of transferring files between two computers on the Internet, but it is not the most secure. If you have trouble remembering the syntax for a command-line utility, you can easily build a widget that calls the utility using the widget.system method and you won’t have to remember the syntax for those powerful but infrequently used commands. In addition to providing web content at your fingertips, widgets can serve as an interface to any of the command-line utilities on your Macintosh.
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