Macos – How to disable flashing terminal in Mac OS

For me in tmux it worked, but in plain iTerm2 not. Solution was setting the Command to /opt/local/bin/bash -l for my used iTerm2 profile. I found the solution at https://trac.macports.org/wiki/howto/bash-completion

To reset your terminal use the reset command.

I don't understand why tail and cat are causing this problem since they shouldn't be doing anything to affect the terminal's line settings. Are you using Terminal.app or another terminal? Are you using Bash or another shell? Are you running screen? Do you have anything else that may be using curses or doing some other screen manipulation? Do you have a trap set for Ctrl-C?