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.
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|CentOS 6.8 Released||May 27, 2016|
|Secure Desktops with Qubes: Introduction||May 27, 2016|
|Chris Birchall's Re-Engineering Legacy Software (Manning Publications)||May 26, 2016|
|ServersCheck's Thermal Imaging Camera Sensor||May 25, 2016|
|Petros Koutoupis' RapidDisk||May 24, 2016|
|The Italian Army Switches to LibreOffice||May 23, 2016|
- Download "Linux Management with Red Hat Satellite: Measuring Business Impact and ROI"
- Secure Desktops with Qubes: Introduction
- Chris Birchall's Re-Engineering Legacy Software (Manning Publications)
- The Italian Army Switches to LibreOffice
- Linux Mint 18
- Petros Koutoupis' RapidDisk
- ServersCheck's Thermal Imaging Camera Sensor
- Oracle vs. Google: Round 2
- CentOS 6.8 Released
- The FBI and the Mozilla Foundation Lock Horns over Known Security Hole
Until recently, IBM’s Power Platform was looked upon as being the system that hosted IBM’s flavor of UNIX and proprietary operating system called IBM i. These servers often are found in medium-size businesses running ERP, CRM and financials for on-premise customers. By enabling the Power platform to run the Linux OS, IBM now has positioned Power to be the platform of choice for those already running Linux that are facing scalability issues, especially customers looking at analytics, big data or cloud computing.
￼Running Linux on IBM’s Power hardware offers some obvious benefits, including improved processing speed and memory bandwidth, inherent security, and simpler deployment and management. But if you look beyond the impressive architecture, you’ll also find an open ecosystem that has given rise to a strong, innovative community, as well as an inventory of system and network management applications that really help leverage the benefits offered by running Linux on Power.Get the Guide