Linux and Unix cheatsheet
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...
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...
PMTU (Path MTU) Discovery
Summary Internet computers, mostly servers, sometimes send packets too large for part of a given path. Not handling this correctly can m...
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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