ssh command returns “stdin: is not a tty”

If you run a command via ssh (secure shell) on linux and you get the following output:

stdin: is not a tty

The most common cause is the mesg y or similar command found in the file:


What is mesg ?

mesg is a Unix command that sets or reports the permission other users have to write to your terminal using the talk and write commands.

How can I fix this issue?

Option 1 would be to comment out the line.

Option 2 would be to change the line to something like this to only invoke the command when you are actually using a connection with tty:

if tty -s; then mesg y; fi

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