Where Would I Find A List Of Keys To Write Different Math Equations

Hi Guys, genuine noob here. I need some help with my first 'puter project -

I have a PI2 running Raspbian, a vintage ZX Spectrum computer & hacked USB keyboard chip.

I've used the USB keyboard chip to interface the keys from the Spectrum into my PI2.

Unfortunately, I'm having problems re-mapping the keys using XMODMAP...

Now this where it gets weird, let me explain -

Firstly, I've managed to successfully map the basic numbers & letters, so that the Spectrum keys trigger the appropriate KeySymbol.
However, I'm having serious problems with the modifier keys...

SHIFT_L is mapping perfectly, and will trigger CAPITALIZED letters.
BUT... I can't seem to get accurate results from my re-mapped ALTGR button -

It works fine for SOME keys, but for others it will behave like SHIFT_L or not work at all

So as you can see below, I've (attempted) to re-map the Spectrum's SYMBOL SHIFT key to 'MOD5' (altgr), so that the 'number' keys will trigger !,@,#,$,%,&,',(,) and _.

so for 12345767890, I SHOULD be getting !@#$&%'()_
But - instead I'm getting 12345&78)_
It's working fine for keys '6', '9' and '0' but NOT for the other keys....

GGGrrrrrr... I don't understand what's happening here

Anyway, this is my xmodmap code. Please help me!

# first, sort out CAPS SHIFT and SYMBOL SHIFT as a shift and AltGr key..
xmodmap -e "keycode 85 = Shift_L"
xmodmap -e "keycode 97 = Control_R"
xset -r 85 # prevent new shift from autorepeating
xset -r 97 # prevent new AlrGr from autorepeating
xmodmap -e "add shift = Shift_L"
xmodmap -e "remove control = Control_R"
xmodmap -e "add mod5 = Control_R"

# one key maps to 'Caps Lock', need to remove this function to get it working
xmodmap -e "remove lock = Caps_Lock"

# Right, standard keys now... top row first, left to right...
xmodmap -e "keycode 89 = 1 1 exclam exclam exclam"
xmodmap -e "keycode 88 = 2 2 at at at"
xmodmap -e "keycode 112 = 3 3 numbersign numbersign numbersign"
xmodmap -e "keycode 34 = 4 4 dollar dollar dollar"
xmodmap -e "keycode 33 = 5 5 percent percent percent"
xmodmap -e "keycode 60 = 6 6 ampersand ampersand ampersand"
xmodmap -e "keycode 173 = 7 7 apostrophe apostrophe apostrophe"
xmodmap -e "keycode 114 = 8 8 parenleft parenleft parenleft parenleft"
xmodmap -e "keycode 106 = 9 9 parenright parenright parenright"
xmodmap -e "keycode 86 = 0 BackSpace underscore underscore underscore"

I should also mention that I've asked this same question on the PI forum, and no one's replied -

https://www.raspberrypi.org/forums/v...8&t=108434&e=0

Hopefully I can get some help here, as this project is currently useless without being able to re-map the keys.

Many thanks

I have a problem with the putty ssh connection. The operating system is Windows 8.
How do I select a few lines and remove them. Using the mouse and shift + arrow keys on the keyboard does not work properly.

i need to complete this exercise but my code has some issues
HERE is the PRoblem:
Create a script that can accept ANY amount of numbers from the command line. Process the numbers one at a time, where numbers greater than 10 print “large”, numbers less than or equal to 10 print “small”
E.g. process 5 10 15 would print
small
small
large

and here is my code so far
if [ $@ -le "10" ]
then
echo "smaller"
else
echo "bigger"
shift
fi
if [ $@ -le "10" ]
then
echo "smaller"
else
echo "bigger"
shift
fi
if [ $@ -le "10" ]
then
echo "smaller"
else
echo "bigger"
shift
fi
if [ $@ -le "10" ]
then
echo "smaller"
else
echo "bigger"
shift
fi

any help would be greatly appreciated

I am new in java. I executed a java program using eclipse. the program contain two java file. when i try to run it using terminal in Ubuntu.
two files are not linking. it shows error. i am attaching all the data.

It shows the following error
Code:

regex2string.java:83: error: cannot find symbol
	                    str = randomstr.nextString(2000);
	                          ^
  symbol:   variable randomstr
  location: class regex2string
1 error
Exception in thread "main" java.lang.NoClassDefFoundError: regex2string
Caused by: java.lang.ClassNotFoundException: regex2string
	at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:323)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:268)
Could not find the main class: regex2string. Program will exit.

I have a script which reads a controller ID and continues. I am trying to add some checks for user input "ctrl".

Valid responses would be whole number 1 thur 5. If value is between 1-5 (single numeric value) then continue with the rest of the script. If any other value then Exit script or continue to ask user input until valid.

I tried a couple of while loops do with esac, but can not seem to get a handle

Code:

read -p "Controller ID#: " ctrl

Any help would be greatly appreciated

Hi,

I have the following when I run gmake to build apache 2.2.29 in Solaris 10 in SPARC hardwa

:
Undefined first referenced
symbol in file
BIO_set_callback ab.o
BIO_set_callback_arg ab.o
BIO_get_callback_arg ab.o
SSL_CTX_set_info_callback ab.o
ld: fatal: symbol referencing errors. No output written to ab
collect2: ld returned 1 exit status
gmake[2]: *** [ab] Error 1
gmake[2]: Leaving directory `/SSL/httpd-2.2.29/support'
gmake[1]: *** [all-recursive] Error 1
gmake[1]: Leaving directory `/SSL/httpd-2.2.29/support'
gmake: *** [all-recursive] Error 1
:

I tried the advised from the result of google around but to no avail.

Appreciate if anyone can gives a pointer. Thanks in advance.

Does anybody know how to make a "Pipe" symbol? I cant seem to figure it out.

Hi,
I am trying to understand MPlayer, and am currently rebuilding some of its source code which includes C and asm files.

Most of the preprocessor symbols are defined in the config.h file, created by the configure script.

In the C files, these symbols are visible in the source by including the config.h header file.

However, in the asm files, I don't see any of such inclusion. Since the asm files also use these preprocessor symbols (e.g. ARCH_X86_64), how are they made visible during the build of the asm files?

When I try building the asm source myself, I get many errors such as:
undefined symbol `ARCH_X86_64' in preprocessor

I was wondering how this is to be done, or if someone knows specifically how this is done in the Mplayer build ?

Again, many thanks for any help you can provide!

PD.

For those of you helping me with the Libreoffice install I took someone's advice in another forum and supposedly installed it. Here is the terminal action:


Quote:
gregg@LG:~/Desktop$ cd LibreOffice_4.2.3.3_Linux_x86_deb/DEBS/
gregg@LG:~/Desktop/LibreOffice_4.2.3.3_Linux_x86_deb/DEBS$ sudo dpkg -i *.deb
[sudo] password for gregg:
Selecting previously unselected package libobasis4.2-base.
(Reading database ... 197387 files and directories currently installed.)
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/usr/bin/gtk-update-icon-cache
gtk-update-icon-cache: Cache file created successfully.
/usr/bin/gtk-update-icon-cache
gtk-update-icon-cache: Cache file created successfully.
Setting up libreoffice4.2-ure (4.2.3.3-3) ...
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Setting up libobasis4.2-extension-nlpsolver (4.2.3.3-3) ...
Setting up libobasis4.2-extension-pdf-import (4.2.3.3-3) ...
Setting up libobasis4.2-extension-report-builder (4.2.3.3-3) ...
Setting up libobasis4.2-gnome-integration (4.2.3.3-3) ...
Setting up libobasis4.2-graphicfilter (4.2.3.3-3) ...
Setting up libobasis4.2-images (4.2.3.3-3) ...
Setting up libobasis4.2-impress (4.2.3.3-3) ...
Setting up libobasis4.2-kde-integration (4.2.3.3-3) ...
Setting up libobasis4.2-math (4.2.3.3-3) ...
Setting up libobasis4.2-ogltrans (4.2.3.3-3) ...
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Setting up libobasis4.2-python-script-provider (4.2.3.3-3) ...
Setting up libobasis4.2-pyuno (4.2.3.3-3) ...
Setting up libobasis4.2-writer (4.2.3.3-3) ...
Setting up libobasis4.2-xsltfilter (4.2.3.3-3) ...
Setting up libreoffice4.2 (4.2.3.3-3) ...
Setting up libreoffice4.2-dict-en (4.2.3.3-3) ...
Setting up libreoffice4.2-dict-es (4.2.3.3-3) ...
Setting up libreoffice4.2-dict-fr (4.2.3.3-3) ...
Setting up libreoffice4.2-draw (4.2.3.3-3) ...
Setting up libreoffice4.2-en-us (4.2.3.3-3) ...
Setting up libreoffice4.2-impress (4.2.3.3-3) ...
Setting up libreoffice4.2-math (4.2.3.3-3) ...
Setting up libreoffice4.2-writer (4.2.3.3-3) ...
Setting up libobasis4.2-base (4.2.3.3-3) ...
Setting up libobasis4.2-calc (4.2.3.3-3) ...
Setting up libobasis4.2-librelogo (4.2.3.3-3) ...
Setting up libobasis4.2-postgresql-sdbc (4.2.3.3-3) ...
Setting up libreoffice4.2-base (4.2.3.3-3) ...
Setting up libreoffice4.2-calc (4.2.3.3-3) ...
Processing triggers for mime-support (3.55ubuntu1.1) ...
Processing triggers for gnome-menus (3.10.1-0ubuntu2) ...
Processing triggers for desktop-file-utils (0.22-1ubuntu2) ...
Processing triggers for shared-mime-info (1.2-0ubuntu3) ...
Unknown media type in type 'all/all'
Unknown media type in type 'all/allfiles'
Unknown media type in type 'uri/mms'
Unknown media type in type 'uri/mmst'
Unknown media type in type 'uri/mmsu'
Unknown media type in type 'uri/pnm'
Unknown media type in type 'uri/rtspt'
Unknown media type in type 'uri/rtspu'
Processing triggers for gnome-icon-theme (3.12.0-1ubuntu1) ...
Processing triggers for hicolor-icon-theme (0.13-1) ...
gregg@LG:~/Desktop/LibreOffice_4.2.3.3_Linux_x86_deb/DEBS$
And Libreoffice shows up in the Applications Menu but it won't launch. Nor does it when I right click on a file and choose 'open with Libreoffice..."

The other program is Sigil. I installed that from a debian file using Gdebi installer. In fact I installed it twice because it didn't open the first time.

So yeah, same thing: it's in the applications menu but it won't launch.

And an unrelated note: I've been getting red lines and stuff sometimes as I type in here. Just like three or four squiggly red horizontal lines (not the spell checker).

Thanks.

These instructions originate from https://www.linkedin.com/pulse/20140...nvidia-drivers, but I modified them slightly for my desktop environment (64-bit HP Envy Phoenix 810-135qe w/Intel i7-4770 and HP ZR2440w monitor, nVidia GeForce GTX645, Red Hat Enterprise Linux 7.1 w/Gnome3).

The following procedures replace the nouveau drivers with kmod-nvidia drivers from ElRepo.

Install the repository ElRepo from: http://elrepo.org/tiki/tiki-index.php

Install the package nvidia-detect from within Applications>SystemTools>Software

From within the terminal, enter the command nvidia-detect.
Example:
[anthony@hp810135qe ~]$ nvidia-detect
Output is...
Probing for supported NVIDIA devices...
[10de:11c4] NVIDIA Corporation GK106 [GeForce GTX 645 OEM]
This device requires the current 346.59 NVIDIA driver kmod-nvidia

For my system the following software packages will apply (yours maybe slightly different, the key is to note the ###.## version identified for your system using nvidia-detect as explained above): kmod-nvidia-346.59-1.el7.elrepo (64-bit), nvidia-x11-drv-32bit-346.59-1.el7.elrepo (64-bit), nvidia-x11-drv-346.59-1.el7.elrepo (64-bit)

Now do the following steps in the sequence indicated:

1. Disable X Windows

a) open a terminal and "su" or "sudo -i"

b) ln -fs /lib/systemd/system/multi-user.target /etc/systemd/system/default.target

Note: Another way to disable X Windows is to do the following from within the Terminal # systemctl set-default multi-user.target

To later change back to booting into graphical mode, substitute 'graphical.target' for 'multi-user.target' in the above commands.

c) reboot

2. Remove Nouveau

a) rpm -e xorg-x11-drivers xorg-x11-drv-nouveau

Note: Another way to remove Nouveau is to do the following from within the Terminal

$ yum remove xorg-x11-drivers xorg-x11-drv-nouveau xorg-x11-glamor

See http://elrepo.org/tiki/kmod-nvidia which discusses that glamor still causes a conflict with nVidia in RHEL 7

3. Blacklist Nouveau

a) edit /etc/modprobe.d/blacklist.conf and add line:

blacklist nouveau

Note: A way to edit this file is by doing the following:

# vi /etc/modprobe.d/blacklist.conf
(use INSERT key to make changes in vi; add the line

blacklist nouveau

Hit Esc key to escape INSERT mode, then hit SHIFT Z Z to save and exit with the changes. Hitting :q ENTER leaves vi without saving changes.

b) edit /etc/default/grub and append to GRUB_CMDLINE_LINUX:

rd.driver.blacklist=nouveau

Note: A way to edit this file is by doing the following:

# vi /etc/default/grub and append to GRUB_CMDLINE_LINUX:
(use INSERT key to make changes in vi; add the line

rd.driver.blacklist=nouveau

Hit Esc key to escape INSERT mode, then hit SHIFT Z Z to save and exit with the changes. Hitting :q ENTER leaves vi without saving changes.

IMPORTANT NOTE IF YOU HAVE AN ENCRYPTED BOOTUP DRIVE -

If you have an encrypted root drive, remove "rhgb" from GRUB_CMDLINE_LINUX. This will allow you to interact with the encryption passphrase prompt, since Plymouth doesn't seem to run without a framebuffer friendly video driver loaded. IF YOU DON'T THIS, WHEN YOU BOOTUP YOU WILL GET STUCK AT A BLINKING CURSOR AND BLACKSCREEN THAT HAS THE FOLLOWING ERROR MESSAGES:


[5.757276] scsi 7:0:0:0: alua: not attached
[5.759625] sd 7:0:0:0: [sdg] no caching made page found
[5.759668] sd 7:0:0:0: [sdg] assuming drive cache: write through

WHEN THIS HAPPENS IT MEANS PLYMOUTH IS NOT ABLE TO SHOW YOU THE PROMPT FOR ENTERING THE PASSPHRASE FOR THE ENCRYPTED DRIVES. WITHOUT THE PROMPT THE SYSTEM CAN'T ACCEPT THE PASSPHRASE AND YOU ARE STUCK. IF THIS HAPPENS TO YOU, YOU CAN DO CTRL-ALT-DELETE TO REBOOT - THIS ALLOWS YOU TO HIT 'e' AT THE KERNEL LINE IN GRUB TERMINAL TO EDIT (MOST LIKELY THE TOP KERNEL) AND THEN REMOVE 'rhgb' (which stands for Red Hat Graphical Bootsplashcreen or something like that). WHEN DONE HIT THE KEYS 'CTRL X' TO REBOOT - YOU'LL THEN SEE TEXT MESSAGES SCROLLING AND GET AN OPPORTUNITY TO ENTER THE PASSPHRASE. ENTER THE PASSPHRASE AND YOU SHOULD BE GOOD TO GO.

4. Reconfigure the grub.cfg files

Two options for booting nowadays are BIOS and EFI

-If you chose BIOS boot run this command:
# grub2-mkconfig -o /boot/grub2/grub.cfg
Note: I also have this one being auto-updated-configured in my system (?why? It's EFI).

-If EFI boot on CentOS:
# grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg

-If EFI boot on RHEL:
# grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg
Note: Mine is an EFI system. But I did both this and the BIOS grub.cfg above since it too is being updated by RHEL updates concurrently with the EFI grub.cfg

5. Reboot and Install NVidia Driver - I use ElRepo's kmod-nvidia for this step.

Steps by me to install ElRepo's kmod-nvidia (You should still be in Text mode at this time):

If in multi-user.target mode (text, runlevel 3), then do the following
$ su -
enter root password
# yum install kmod-nvidia - version from above
# yum install nvidia-x11-drv-32bit - version from above (this is for 32bit compatibility)
# yum install nvidia-x11-drv - version from above (this is for Open GL X11 display driver and to be done if kmod didn't already include doing it with the kmod-nvidia installation above)
# exit
$

If still in graphics.target mode (you shouldn't be but if you are) (GUI, runlevel 5),
Use Applications > Software > kmod-nvidia - version from above
Install kmod-nvidia - version from above
Install nvidia-x11-drv-32bit - version from above (this is for 32bit compatibility)
Install nvidia-x11-drv - version from above (this is for Open GL X11 display driver)

6. At this point rebuild initramfs. This recreates initrd w/o nouveau. The existing initrd still has the embedded nouveau drivers if this step is not performed) :

Back up the current initramfs keeping nouveau
# mv /boot/initramfs-$(uname -r).img /boot/initramfs-$(uname -r)-nouveau.img
Build the new one without nouveau
# dracut /boot/initramfs-$(uname -r).img $(uname -r)

7. Re-Enable X Windows

# systemctl set-default graphical.target

8. Reboot

If you have an encrypted bootup drive, when you bootup you may notice that Plymouth doesn't look so good with its text in a lower resolution and you'll see lines of text scrolling until you get to a stopped cursor waiting for you to enter the passphrase to unencrypt your drive. Maybe eventually there'll be a solution for this to keep things moving with a graphical bootsplash all throughout. Until then, this is a minor inconvenience for me.