tput bel

• tput bel
• while true; do tput bel; sleep 1; done

Related

• echo -e '\a'
• afplay
• ffplay
• say beep
• wikipedia:Bell character
• zenity --info --text "hello world"
• ping -a

See also

• tput, tput bel, tput help
• Sound notifications: tput bel, paplay, echo -e '\a', printf '\7', osascript -e 'beep 1', afplay, ping -a, say, ntfy.sh, bip (alias)