Category Archives: Computers and Internet

Taking a snapshot of part of a Mac’s screen

The following are the steps to take snapshot of part of a Mac’s screen. Instructions:   Taking a Snapshot of Any Area on the Screen Press Command + Shift + 4. Your pointer becomes a crosshair. Drag the crosshair to … Continue reading

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Sort file by file size via Unix/Linux shell

  To sort certain files in the directory and to showthe biggest file first, do the following from shell.   $ du -a | sort -n -r

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DS and OC technologies

  DS and OC technologies are primarily used in a high speed digital connection capable of transmitting data at high rate on the point to point WAN interface. Digital Signal (DS) – A classification of digital circuits. The DS technically … Continue reading

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Window Vista Disk Defragment

The disk defragmenter takes fragmented files and puts them back together so that the hard drive doesn’t have to work as hard to get them. By default Windows Vista’s Disk Defragmenter automatically defragments your hard drive(s) on a schedule for … Continue reading

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Prime Number History

  Recently, I used N-ways hash table algorithm to apply it in my designed router software. Because I need to make my hash table size to be prime number size in my designed software, this prime usage sparks my desire … Continue reading

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GMT vs. UTC

GMT vs. UTC My co-worker and me debugged router software on our Core router. I had a discussion on the UTC, GMT and PST time when we saw the timestamp in syslog and trace are different. The timestamp in syslog … Continue reading

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My Computer Room

The following picture is  my computer room. I work in this room every night.  In this room, I setup wireless home router with a cable modem to connect all my computers to Internet.  My computers can connect to Internet via … Continue reading

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