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linux systems

Linux / Unix Shell: Set Default Printer

How do I set default printer in my Bash shell under CentOS Linux or FreeBSD unix desktop operating systems?
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How do I display a list of bridges under Linux? How do I show info about the Ethernet bridge configuration in the Linux kernel?
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I'm using a Cisco Linksys WAG320N Router to connect my OS X UNIX and Linux systems to the Web. How do I reboot my Linksys WAG series router / gateway (modem) from UNIX / Linux / OS X bash command prompt or using a shell script?
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CentOS / Redhat: Turn On SELinux Protection

SELinux enforces the idea that programs should be limited in what files they can access and what actions they can take. However, by default it is turned off under RHEL / CentOS 5.x server? How do I turn it on? How can I enable SELinux on CentOS / RHEL 6 IBM server?
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Ubuntu Linux: Find Out Default Gateway

How do I find out default gateway IP address (default router IP assigned) for my Ubuntu Linux systems?
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CentOS Add Route Command

How do I add route (router IP 192.168.1.254) to my Centos Linux systems from the command line?
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Red Hat / CentOS: Check / List Running Services

Q. How do I list all currently running services in Fedora / RHEL / CentOS Linux server?
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