linux

du --max-depth=1 /home/ | sort -nr

$ grep -r "text" /home/xu

In Ubuntu 10.10 and later, users cannot ptrace processes that are not a descendant of the debugger. Run the following command to enable:

echo 0 | sudo tee /proc/sys/kernel/yama/ptrace_scope

This will work until rebooting, change PERMANENT as following: change

kernel.yama.ptrace_scope = 1

to

kernel.yama.ptrace_scope = 0

in

/etc/sysctl.d/10-ptrace.conf .

• luach gconf-editor
• go to app/nautilus/desktop
• uncheck volumes_visible

I tried to configure my desktop today ( change the input method in fact), but then I can not login anymore! I searched in the internet, there are so many possible problem… the real problem is that I can not find out what is wrong! The solution is to see ~/.xsession-errors

• Install Ubuntu (Note: choose mount point/partition by ourselves)
• Reboot
• Configure /etc/fstab to mount all the partitions
• Install emacs & emacs-goodies-el (to write this notes :) (Note: find problem with --debug-init )
  • add to quick laucher
    • cp /usr/share/applications/emacs23.desktop ~/.local/share/applications/
    • editor ~/.local/share/applications/ Exec to command that I use (a shell script), the result file:

[Desktop Entry]
Version=1.0
Name=GNU Emacs 23
GenericName=Text Editor
Comment=View and edit files
MimeType=text/english;text/plain;text/x-makefile;text/x-c++hdr;text/x-c++src;text/x-chdr;text/x-csrc;text/x-java;text/x-moc;text/x-pascal;text/x-tcl;text/x-tex;application/x-shellscript;text/x-c;text/x-c++;
Exec=sh /media/Data/git/projects/bash/editor %F
TryExec=emacs23
Icon=/usr/share/icons/hicolor/scalable/apps/emacs23.svg
Type=Application
Terminal=false
Categories=Utility;Development;TextEditor;

• Install thunderbird
  • Replace Evolution with Thunderbird
• Install printer
• Install Sun Java
  • Synaptic Package Manager>Settings>Repositories
  • Select Other Software then Mark the Canonical Partners
  • In the Quick Search box, write "sun java", install jre and jdk
  • sudo update-alternatives --config java choose sun java
• Use Empathy instaed of Pidgin, it is integrated better with gnome, and the chat history remains!
• Programming
  • Install Netbeans
  • Install premake4
  • Install git
  • Install bzr
• Chinese setup
• Install Dropbox
• Install Guake

  Because the Super key is used by Unity, so I have to change the shortcut of Guake to Alt+c, it is a little inconvenient. And modify the source code ( /usr/lib/guake/guake.py ) to put the Guake in the bottom of screen, like this:

def get_final_window_rect(self):
        """Gets the final size of the main window of guake. The height
        is the window_height property, width is window_width and the
        horizontal alignment is given by window_alignment.
        """
        screen = self.window.get_screen()
        height = self.client.get_int(KEY('/general/window_height'))
        width = 100
        halignment = self.client.get_int(KEY('/general/window_halignment'))

        # get the rectangle just from the first/default monitor in the
        # future we might create a field to select which monitor you
        # wanna use
        window_rect = screen.get_monitor_geometry(0)
        total_width = window_rect.width
        total_height = window_rect.height # total height of screen
        window_rect.height = window_rect.height * height / 100
        window_rect.width = window_rect.width * width / 100

        if width < total_width:
            if halignment == ALIGN_CENTER:
                window_rect.x = (total_width - window_rect.width) / 2
            elif halignment == ALIGN_LEFT:
                window_rect.x = 0
            elif halignment == ALIGN_RIGHT:
                window_rect.x = total_width - window_rect.width
        window_rect.y = (total_height - window_rect.height) # set y 
        return window_rect

• Remove Apache: why do I need http server in my laptop??
• Install "Flash Aid" plugin of Firefox 2011-05-12 Thu

mkisofs -o /tmp/cd.iso /tmp/directory

• install PAE (Physical Address Extension) kernel to support 4G RAM (update: 2011-05-02 Mon I use 64Bit system instead now! )
• mount /tmp to RAM by adding this line in /etc/fstab

  # mount tmpfs in /tmp/
  tmpfs /tmp tmpfs size=1024m,mode=1777 0 0
  

• change swappiness: add vm.swappiness=10 in /etc/sysctl.conf