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How To Add Swap on FreeBSD Unix Systems

I need additional swap space to improve my FreeBSD Unix server/desktop performance. How do I add a swap file to FreeBSD system using command line options without creating a new partitions? How do I encrypt swap space on a FreeBSD Unix server for security purpose?
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I have Soekris single board communication embedded computers which is optimized for low power and network usage. The server has four Ethernet ports. I've installed PFSense firewall on it and configure WAN + LAN ports. How do I setup IPv4 software bridge using PFSense so that the rest of ports act as a network switch?
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How To Change Timezone on a CentOS 6 and 7

I set my time zone to 'America/New_York' on a CentOS Linux 7 server. I want to see date and time in my timezone in log files. How can I change the current timezone from 'America/New_York' to 'America/Chicago' using command line?
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I'm using CentOS 7 server. I need to run a command when I logout using ssh or bash shell. So in Linux and Unix-like systems, how can I run a command to execute when I log out my session?
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I'm a new Linux, OS X or Unix-like system users. I'm using bash shell. I made changes to my $HOME/.profile ($HOME/.bash_profile) file. How can I restart my session without doing logout and login again?
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I'm a new FreeBSD unix user. How can I install MariaDB database server on a FreeBSD unix based system?
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I want to extract tar file to specific directory called /tmp/data. How can I extract a tar archive to a different directory using tar command on a Linux or Unix-like systems?
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