Shared folders in Linux Guest on Windows Host

This issue occurs if the GCC and PAE kernels are not up to date in the Linux VM and the hgfs folder is not created in the /mnt folder.

1. su - 
   
2. yum install gcc gcc-c++ make binutils
3. yum update kernel
4. reboot
5. ./vmware-install.pl
6. Power on the virtual machine. The shared folder should be accessible in the given location, /mnt/hgfs/.

• ho0 Likes

Accessing your Virtualbox Guest from your Host OS

Nine explanation...

Accessing your Virtualbox Guest from your Host OS

Linux I/O Performance Tests using dd

dd if=/dev/zero of=test2.img bs=164K count=100000 oflag=dsync
dd bs=1M count=1024 if=/dev/zero of=test conv=fdatasyn


https://romanrm.net/dd-benchmark

Install Htop 2.0 for CentOS 7

yum groupinstall "Development Tools"
yum install ncurses ncurses-devel
wget http://hisham.hm/htop/releases/2.0.0/htop-2.0.0.tar.gz
tar xvfvz htop-2.0.0.tar.gz
cd htop-2.0.0
./configure
make
make install

Comsol: Tuning the Java heap size

If you get an error message like this: 
                Error in sweep: Java heap space
try to increase the Java heap. Open the comsol.ini file located in the subdirectory bin/$arch in the COMSOL installation directory, where $arch corresponds to the platform you are using. Modify the number in the row that starts with -Xmx, its value is the Java heap size. If you have enough RAM, try doubling the size. This will give the line -Xmx2048m for a 64-bit platform. Repeat this for all *.ini files in the same directory.

If you do not have write permission to the bin/$arch directory, you can instead try the following:

• Copy the comsol.ini file to a folder where you have write permission.
• Open the file and modify it according to the instructions above.
• When you launch COMSOL, add the option -comsolinifile [path] to the COMSOL command, where [path] is the path to your new comsol.ini file.

Also here we can find some recommendations on how to deal with java.lang.OutOfMemoryError in Java, http://javarevisited.blogspot.co.il/2011/09/javalangoutofmemoryerror-permgen-space.html

How to Check Your Disk Quota under Linux

quota -v

du -sh <directory>

df -h <directory>

Color schemes - Midnight Commander

[Colors]

base_color=normal=lightgray,black:input=white,brightred:errors=white,brightred:gauge=yellow,red:selected=gray,lightgray:marked=yellow,black:markselect=yellow,brown:directory=white,black:executable=brightgreen,black:link=green,black:device=brightmagenta,black:special=brown,black:core=brightred,yellow:menu=gray,lightgray:menuhot=yellow,lightgray:menuhotsel=brightred,black:dnormal=white,gray:dfocus=white,brightgreen:dhotnormal=brightred,gray:dhotfocus=brightred,gray:editmarked=white,brightred:editnormal=white,black:editbold=blue,brown:reverse=yellow,black:helpnormal=white,black:helpitalic=brightmagenta,black:helpbold=brightcyan,black:helpslink=yellow,black:helplink=brightblue,black:viewunderline=brightgreen,white

Ubuntu:How to change my MS mouse wheel scroll rate?

Some MS mice have a scrollwheel bug. Try unplugging the USB cable/dongle then plug back in.

VNC server on ubuntu 14.04

#!/bin/sh

# Uncomment the following two lines for
export XKL_XMODMAP_DISABLE=1
unset SESSION_MANAGER
unset DBUS_SESSION_BUS_ADDRESS
# exec /etc/X11/xinit/xinitrc

#[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
#[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
#xsetroot -solid grey
vncconfig -iconic &
#x-terminal-emulator -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
#x-window-manager &

gnome-panel &
gnome-settings-daemon &
metacity &
nautilus &
gnome-terminal &






normal desktop:

Maple: Display plots several plots together

with(plots);
p1 := plot(sin(x), x = 0 .. 2*Pi, color = red);
p2 := plot(cos(y), y = -Pi .. Pi, color = blue);
display({p1, p2});

How to create a bootable USB on Linux

Installation

1. Using UNetbootin

2.

sudo mkdir /media/iso/
sudo mount -o loop /path/to/ubuntu.iso /media/iso

cp -a /media/iso/. /media/xxx/

sudo apt-get install syslinux mtools
sudo syslinux -s /dev/sdd1

Then rename the isolinux directory in media/xxx/ to syslinux, rename the file isolinux.cfg to syslinux.cfg.



In case of the message:

"The installer has tried to mount image #1, but cannot find it on the hard drive.Please copy this image to the drive and click Retry.Click Exit to abort the installation."

press Ctrl-Alt-F2

mount /dev/sdc1 /mnt/foldername

ps -ef | grep sd

copy /mnt/foldername/centos.iso /mnt/isodir/centos.iso

press Ctrl-Alt-F6