Linux and Unix cheatsheet
Linux Netfilter tweaks for High traffic servers
If you are serving a high traffic web/DNS server, and recently having PING loss to the server and not all HTTP request were successful to i...
TIME_WAIT in netstat
So, ever wonder what all those TIME_WAITs are doing in your netstat listing? Okay, for those of you who don't spend all your waking hou...
Detecting and preventing SYN Flood attacks on web servers running Linux
The other day I helped a client deal with a SYN flood denial of service attack. This article describes the symptoms, diagnosis and solution ...
running a cron at every month end
If tomorrow's date is 01, condition will be true and it will execute subsequent command.
55 23 * * * [ `date -d tomorrow +\%d` -eq '01' ] && /path/to/script
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