The sound in my ubuntu 9.04 stopped working correctly, and instead of playing a song, all I heard was static.
I tried a number of different things such as restarting pulseaudio and reloading the kernel modules. But the problem was that the PCM mixer’s volume was muted, and a way to change it is with alsamixer.
alsamixer -Dhw
Sometimes the keyboard stops working properly when I run windows inside a VMWare virtual machine. The key bindings gets all screwed up and the the cap locks, shift, and ctrl keys stop working.
As a workaround you can just execute setxkbmap in to remap the the keyboard.
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/195982
These are the VIm commands I found most useful for coding.
| :%s/old/new/g | Replace all occurences of “old” by “new” in file |
| :%s/old/new/gw | Replace all occurences with confirmation |
| :2,35s/old/new/g | Replace all occurences between lines 2 and 35 |
| :5,$s/old/new/g | Replace all occurences from line 5 to EOF |
| :%s/^/hello/g | Replace the begining of each line by “hello” |
| :%s/$/Harry/g | Replace the end of each line by “Harry” |
| :%s/onward/forward/gi | Replace “onward” by “forward” , case unsensitive |
| :%s/ *$//g | Delete all white spaces |
| :g/string/d | Delete all lines containing “string” |
| :v/string/d | Delete all lines containing which didn’t contain “string” |
| :s/Bill/Steve/ | Replace the first occurence of “Bill” by “Steve” in current line |
| :s/Bill/Steve/g | Replace “Bill” by “Steve” in current line |
| :%s/Bill/Steve/g | Replace “Bill” by “Steve” in all the file |
| :%s/\r//g | Delete DOS carriage returns (^M) |
| :%s/\r/\r/g | Transform DOS carriage returns in returns |
| :%s#<[^>]\+>##g | Delete HTML tags but keeps text |
| :%s/^\(.*\)\n\1$/\1/ | Delete lines which appears twice |
| Ctrl+a | Increment number under the cursor |
| Ctrl+x | Decrement number under cursor |
| ggVGg? | Change text to Rot13 |
| :set autoindent | Turn on auto-indent |
| :set smartindent | Turn on intelligent auto-indent |
| :set shiftwidth=4 | Defines 4 spaces as indent size |
| ctrl-t, ctrl-d | Indent/un-indent in insert mode |
| >> | Indent |
| << | Un-indent |
| :syntax on | Turn on syntax highlighting |
| :set syntax=java | Force syntax highlighting (try java, perl, python, etc) |
Here is a way of retrieving the a query string parameter from a URL. (e.g. http://localhost/app/details.faces?userId=1)
HttpServletRequest request = (HttpServletRequest) FacesContext.
getCurrentInstance().
getExternalContext().
getRequest();
String ID = request.getParameter("userId");
libnotify allows a program send a notification to your desktop through notification-daemon.
To be able to use it in your code you’ll need the appropriate header files and shared library to link against which can be found in the libnotify-dev package.
Here is a sample program taken from the libnotify package source.
#include <libnotify/notify.h>
#include <stdio.h>
#include <unistd.h>
int main(int argc, char * argv[] )
{
NotifyNotification *n;
notify_init("Basics");
n = notify_notification_new ("Foo",
"Bar",
NULL, NULL);
notify_notification_set_timeout (n, 5000); // 5 seconds
if (!notify_notification_show (n, NULL))
{
fprintf(stderr, "failed to send notificationn");
return 1;
}
g_object_unref(G_OBJECT(n));
return 0;
}
Alternatively, here is the same program in python.
import pynotify pynotify.init(’foo’); pynotify.Notification(’foo’, ‘bar’).show()