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countdown.sh

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+#!/bin/bash
+
+# 2020 Dave Bechtel
+# Display a rotating-prompt countdown with keypress early escape
+# REF: https://stackoverflow.com/questions/12498304/using-bash-to-display-a-progress-indicator
+
+# number
+declare -i countto=$1
+ctr=0
+
+# array
+declare -a spin
+spin[0]="-"
+spin[1]='\'
+spin[2]="|"
+spin[3]="/"
+
+echo -n "[$countto] ${spin[0]} " #$ctr"
+
+while [ $countto -ge $ctr ]; do
+  for i in "${spin[@]}"
+  do
+	let cdown=$countto-$ctr
+	printf "\r$countto $i $cdown     "
+        sleep 1
+	let ctr=$ctr+1
+	[ $ctr -ge $countto ] && break
+	read -n 1 -t .1 && break 2
+# ESC if key pressed
+  done
+done
+echo ''