For those of us that often have to use console servers to connect over IP to serial ports of devices, the removal of telnet from High Sierra is a bit of a pain in the bum. Here are two things you can do:
Use the ‘nc’ command to connect in exactly the same way as you used to do at the command-line with telnet. For example: nc <IP address> <Port Number>
SFTP is good and I use it wherever I can, but sometimes you come across some old kit that can’t support SSH or SFTP, so you just need those old tools. An alternative is to do this:
- Enter Time Machine
- Look for a backup taken from before your upgrade. You can
- If you’re not using the time-machine interface, you can find your backup here: /Volumes/com.apple.TimeMachine.localsnapshots/Backups.backupdb/
- In the appropriate backup subdirectory, look in usr/bin and you should find the telnet and ftp executable files.
- Copy these to your machine in /usr/local/bin
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