task

#!/bin/bash

_FAIL="[-]"
_SUCCESS="[+]"
_NOTE="[*]"

function _progress()
{
    local PID=$1
    local msg="$2"
    local delay=0.25
    local str=("/" "-" "\\" "|")
    local index=0

    while kill -0 $PID &>/dev/null; do
        echo -ne "\r[${str[$index]}] "$msg"  "
        sleep $delay
        index=$(bc <<< "(($index+1) % ${#str[@]})")
    done
}


function _task()
{
    eval "$1" &> "$logFile" &
    local pid=$!

    if [ -t 1 ]; then
        _progress $pid "$2"
    else
        echo -en "\r[...] "$2""
        wait $pid
    fi

    wait $pid

    local ret=$?
    if ! (( $ret )); then
        echo -en "\r$_SUCCESS "$2"  \n"
    else 
        echo -en "\r$_FAIL "$2"  \n" 
    fi

    return $ret
}

export logFile=/dev/null
_task "sleep 3 && true" "Sleep and true"
_task "sleep 3 && false" "Sleep and false"