Invoking the cd utility by itself (that is, without any arguments) will change the current directory to the directory specified by the $HOME environment variable:
nick@nimble ~ $ cd /tmp/ nick@nimble /tmp $ cd nick@nimble ~ $
Invoking the cd utility with a single hyphen (-) argument will return you to the previous directory you were in.
If you accidentally issue a cd without any arguments, typing cd - is a convenient way of returning to the directory you came from—in essence functioning as an undo operation:
nick@nimble ~/a/long/path/to/some/files $ cd nick@nimble ~ $ cd - /home/nick/a/long/path/to/some/files $ nick@nimble ~/a/long/path/to/some/files $
Or, if you want to alternate between two directories, cd - makes this simple:
nick@nimble ~/path/to/some/files $ cd ~/another/path/to/some/files/ nick@nimble ~/another/path/to/some/files $ cd - /home/nick/path/to/some/files nick@nimble ~/path/to/some/files $ cd - /home/nick/another/path/to/some/files nick@nimble ~/another/path/to/some/files $
Garmin is a popular brand of GPS devices. Unfortunately, Garmin makes its MapSource application only for Windows, not Linux. However, Wine runs MapSource, at least for Garmin GPS units that communicate via USB.
The following procedure is based on:
The current Wine package (wine-0.9.56-1.fc8)
A Garmin Vista CX, with the standard USB cable
Install Wine (as root):
# yum install wine
Make sure that you can access the GPS device. For my installation, the device is /dev/ttyUSB0. I found this by examining /var/log/messages when attaching the device. Check the permissions of the device file, and make sure you have access to it, possibly by adding yourself to the group that owns the device. In my case, I had to add myself to the group uucp. Remember to log out and log back in if you add yourself to a new group.
Now, define the device in Wine. This is done as follows (do this using your normal login, not as root):
$ ln -s /dev/ttyUSB0 ~/.wine/dosdevices/com2
This will define the /dev/ttyUSB0 device as COM2 under Wine.
After that, you simply install the software on the Garmin CD. For example, for City Navigator NT (Europe), using your normal login, do the following:
$ cd /media/CNEURNTV9 $ wine ./Setup.exe
At the end, don't opt to start the program directly. Start it afterward via the command line:
$ wine ~/.wine/drive_c/Garmin/MapSource.exe
Using this procedure, I am able to unlock maps, make routes, upload and download from the GPS unit (via USB) and do software updates.
For more information, see my Web page: www.peterverthez.net/gps/garmin-linux.html.
When you are hunting for a configuration problem with services like Apache and MySQL, you may have to execute a sequence of commands repeatedly, such as:
/etc/init.d/apache stop /etc/init.d/mysql stop /etc/init.d/mysql start /etc/init.d/apache start
You can create a script to do this, or you can put all the commands on one line separated by semicolons:
/etc/init.d/apache stop; /etc/init.d/mysql stop; \ /etc/init.d/mysql start; /etc/init.d/apache start
However, as you do other things, you sometimes lose “quick” access to the command line in the shell history. To avoid this, “tag” the line with a comment that will make it easy to find:
/etc/init.d/apache stop; /etc/init.d/mysql stop; \ /etc/init.d/mysql start; /etc/init.d/apache start; #apmy
Now, to recall the command, simply do Ctrl-R + apmy, and you should have the command, as long as you've chosen your “tags” wisely.
|Contrast Security's Contrast Enterprise||Aug 30, 2016|
|illusive networks' Deceptions Everywhere||Aug 29, 2016|
|Happy Birthday Linux||Aug 25, 2016|
|ContainerCon Vendors Offer Flexible Solutions for Managing All Your New Micro-VMs||Aug 24, 2016|
|Updates from LinuxCon and ContainerCon, Toronto, August 2016||Aug 23, 2016|
|NVMe over Fabrics Support Coming to the Linux 4.8 Kernel||Aug 22, 2016|
- Download "Linux Management with Red Hat Satellite: Measuring Business Impact and ROI"
- Contrast Security's Contrast Enterprise
- illusive networks' Deceptions Everywhere
- Happy Birthday Linux
- What I Wish I’d Known When I Was an Embedded Linux Newbie
- New Version of GParted
- All about printf
- ContainerCon Vendors Offer Flexible Solutions for Managing All Your New Micro-VMs
- Tech Tip: Really Simple HTTP Server with Python
With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide