I have a shell script which sends email when the disk is more than 80% full; when I run the script as sh -x script.sh or ./script.sh I get an email but when I keep the script in cronjob I do not get any email.The script has execute permissions (755). When I type mail I can see the cronjob has ran at that time, but there is no email sent. 
Shell Script does not send email from Cron job
shell script;cron