October 20, 2017

Mac OS X

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

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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 reached.
We use the df command which reports the file system disk space usage including the amount of disk space available.

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

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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 specific order. The command-line tool join can do exactly that. In this tutorial we will show you how to join two CSV files.

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

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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 holds the name, email address, phone and many more of the IP address owner.

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How to Compress and Extract a complete Linux or UNIX Directory

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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 we show you how to compress and extract a complete directory on a Linux or UNIX system.

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How to Clear DNS Cache in Mac OS X

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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.

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