Log BrowserStackLocal process details to a log file using shell script on MAC OS X and Linux systems

logging.sh

#!/bin/bash

#To start logging output of grep command every 10 seconds, use:
#Mac: sh logging.sh 10
#Linux: bash logging.sh 10

if [ "$1" != "" ]; then
    re='^[0-9]+$'
    if ! [[ $1 =~ $re ]] ; then
        echo "Invalid Argument" >&2; exit 1
    fi
    # Message to stop logging
    echo "Hit [CONTROL+C] to stop logging!"

    # Start Logging
    while :
        do
                ps aux | grep browserstack | grep -v grep | sed "s/^/$(date)/" >> bslocal.log
            sleep $1
    done
else
    echo "Please pass time in seconds as command line argument"
fi