Shell Programming and Scripting

#!/bin/bash

# paste following in your script
declare -a Spinner

Spinner=(/ - \\ \| / - \\ \| ) 
Spinnerpos=0

update_spinner()
{
    printf "\b"${Spinner[$Spinnerpos]} 
    (( Spinnerpos=(Spinnerpos +1)%8 ))
}

# testing : 

printf "Spinner :  "

update_spinner
sleep 1
update_spinner
sleep 1
update_spinner
sleep 1
update_spinner
sleep 1
update_spinner
sleep 1
update_spinner
sleep 1
update_spinner
sleep 1
update_spinner
sleep 1
update_spinner
sleep 1
update_spinner
sleep 1
update_spinner
sleep 1
update_spinner

# paste following in your script
#declare -a Spinner


#Spinner=(/ - \\ \| / - \\ \| )
set -A Spinner / - \\ \| / - \\ \|
Spinnerpos=0

update_spinner()
{
    printf "\b"${Spinner[$Spinnerpos]}
    (( Spinnerpos=(Spinnerpos +1)%8 ))
}

# testing :

printf "Spinner :  "

update_spinner
sleep 1
update_spinner
sleep 1
update_spinner
sleep 1
update_spinner
sleep 1
update_spinner
sleep 1
update_spinner
sleep 1
update_spinner
sleep 1
update_spinner
sleep 1
update_spinner
sleep 1
update_spinner
sleep 1
update_spinner
sleep 1
update_spinner

#!/bin/ksh

cursor[0]='\|'
cursor[1]='/'
cursor[2]='-'
cursor[3]='\\'
cursor[4]='\|'
cursor[5]='/'
cursor[6]='-'

pos=0
let breakout=1
update_cursor()
{
    printf "\b"${cursor[pos]} 
    pos=$(( ( pos + 1 )  % 7 ))
}

trap "let breakout=0" USR1

#background process sleeps 10 seconds, raise USR1 signal
export this_pid=$$

# tar check goes here where sleep is
sleep 4 && kill -USR1 $this_pid &

echo "spinning cursor sort of.... \c"

while [[ $breakout -eq 1 ]]
do 
  update_cursor
  sleep 1
done