How to enable/disable/start/stop a service in Fedora 16

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How to improve performance of Linux application

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How to find size of code and data segments of a program

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How to catch signals in a bash script

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How to print all lines of a data file in reverse order

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How to convert spaces in a file to TABs and vice versa using unexpand and expand commands

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How to find Ethernet MAC address of my PC in various operating systems

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How to change MAC address of Ethernet interface in Linux or Windows or Mac OS X

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How to loop or iterate through the output of ls command in a bash script

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What are the useful fields of $_SERVER array in PHP

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