# **************************************************************

# This function display a progress process.

# To start the f_process function, you have to send the function

# into the background. To stop the f_progress function, you have

# to define the argument "stop".

#

# EXAMPLE:

#

#    echo -n "Starting some daemon "; f_progress &

#    if sleep 10; then

#       f_progress "stop"; echo -e "\t[ OK ]"

#    else

#       f_progress "stop"; echo -e "\t[ FAILED ]"

#    fi

#

function f_progress () {

local action=${1:-"start"}

declare -a sign=( "-" "/" "|" "\\\\" )

# define singnal file...

[ "$action" = "start" ] && echo 1 > /tmp/signal

[ "$action" = "stop" ] && echo 0 > /tmp/signal

while [ "$( cat /tmp/signal 2>/dev/null )" == "1" ] ; do

    for (( i=0; i<${#sign[@]}; i++ )); do

        echo -en "${sign[$i]}\b"

        # with this command you can use millisecond as sleep time - perl rules ;-)

        perl -e 'select( undef, undef, undef, 0.1 );'

    done

done

# clear the last ${sign[$i]} sign at finish...

[ "$action" = "stop" ] && echo -ne " \b"

}