scripts/progress-indicator

#!/bin/sh
# Propeller progress indicator
FRAME="A"
PID=$1

touch "/tmp/pi.$PID"
while [ -f "/tmp/pi.$PID" ]; 
do
  case $FRAME in
    A) echo -n -e "\b"
       echo -n '|'
       FRAME=B;;
    B) echo -n -e "\b"
       echo -n '/'
       FRAME=C;;
    C) echo -n -e "\b"
       echo -n '-'
       FRAME=D;;
    D) echo -n -e "\b"
       echo -n '\'
       FRAME=A;;
  esac
  sleep 1
done