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How to Clear DNS Cache in Mac OS X

Mac OSX caches the DNS requests to speed up lookups. When you configure your DNS server you don’t want to work with cached values. Use dscacheutil to clear the cache Open the Mac OSX terminal and run...

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How to Compress and Extract a complete Linux or UNIX Directory

Sometimes it is useful to compress a complete directory. For example to backup the files or to send them to an other server. Transfering a compressed directory will save you some time. In this tutorial...

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How to Find the Owner of an IP Address on Unix, Linux and BSD Systems

Every IP address is registered to an ISP or organisation. On Unix, Linux and BSD systems you can check the WHOIS database entry with the whois command in your command-line interface. The WHOIS record...

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How to Join Two CSV Files on Unix, Linux and BSD Systems

Suppose you have two CSV files and want to join them to one CSV file. For this you need a tool to extract selected fields and combine them to a new file. The tool should also arrange the fields in a...

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How to Get an Alert When Your Disk Is Full on Unix, Linux and BSD Systems

Do you want to get an alert once your disk is full on Unix, Linux or BSD Systems? In this tutorial we will show you to set up a simple cron script which sends you an email once a specific disk limit is...

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