unix and linux

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 truncate a UNIX binary log file using command line options?

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How do I find symlink(s) under UNIX and Linux operating systems?

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How do I open the TCP or UDP ports under UNIX / Linux like operating systems?

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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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How do I setup NFS v4.0 distributed file system access server under CentOS / RHEL v5.x for sharing files with UNIX and Linux workstations? How to export a directory with NFSv4? How to mount a directory with NFSv4?

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How do I list only user dot-files from $HOME under UNIX and Linux operating systems? How do I ensure that user Dot-Files are not World-writable?

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