Check clients which connect to Mac OS X Wi-Fi Internet Sharing

arp -i bridge100 -a


bridge100 may be different on your Mac OSX

Node.js for Mac

Source: http://icarus4.logdown.com/posts/175092-nodejs-installation-guide

1. Install NVM (Node.js Version Manager)
   1.1. Add "source $(brew --prefix nvm)/nvm.sh" to ~/.bash_profile
   1.2. Source ~/.bash_profile

2. Install Node.js
   2.1. List available versions by "nvm ls-remote"
   2.2. Install the LTS by "nvm install v6.9.2"


Node.js directory: /usr/local/opt/nvm/versions/node/vX.X.X
Installed versions: nvm ls
Current in use version: nvm -v
To switch version: nvm use vX.X.X (only valid for current shell). To fix it, set it as default version to use: nvm alias default vX.X.X

Samba server on Ubuntu

. Install samba server on ubuntu if not done yet.

    sudo apt-get install samba

. Create an user, howard.

    sudo useradd howard

. Create a samba user, howard, and set the password.

    sudo smbpasswd -a howard

. Configure the shared folder permission info in samba config file.

    sudo vi /etc/samba/smb.conf

    Add following info to the end of smb.conf file

    [src]

    path = /home/howard/src/

    browseable = yes

    read only = no

    writeable = yes

    create mask = 0755

    directory mask = 0755

    valid users = howard

. Restart the samba service and it's now ready!

    sudo service smbd restart

[To connect the samba server from a Mac OS X]

    Go to finder and Cmd+K, enter smb://IPOfUbuntu/src

The file is damaged and should be moved to the trash

The problem could be fixed by turned off the gatekeeper.

1. Disable the gatekeeper by
   . sudo spctl --master-disable
2. Right click on the application and click open. It should work now.
3. Enable the gatekeeper by
   . sudo spctl --master-enable



To check the status of the gatekeeper:
   . sudo spctl --status

NFS server on Ubuntu

Setup NFS server on Ubuntu:
   . sudo apt-get install nfs-kernel-server
   . Create a folder for sharing
      . mkdir PATH_TO_SHARE
      . chmod -R 777 PATH_TO_SHARE
   . Edit /etc/exports
      . sudo vi /etc/exports
      . add following line and save
         PATH_TO_SHARE *(rw,sync,insecure,no_root_squash,no_all_squash)
   . Refresh updated /etc/exports
      . sudo exportfs -r
   . Restart NFS server
      . /etc/init.d/nfs-kernel-server restart
   . Check shared NFS folders
      . showmount -e localhost


Connect to NFS server on Ubuntu from Mac OS X
[Finder]
   . Cmd + K (Finder -> Go -> Connect to Server )
     . nfs://IPOfUbuntu:/PATH_TO_SHARE
[Terminal]
   . Check what folders have been shared
      . showmount -e IPOfUbuntu
   . Create a mount point
      . mkdir MOUNT_POINT
   . Mount nfs to local MOUNT_POINT folder
      . sudo mount -o resvport,rw -t nfs IPOfUbuntu:/PATH_TO_SHARE MOUNT_POINT

Capture packets from iOS devices on Mac OS with Wireshark

RVI (Remote Virtual Interface)

1. Connect your iOS device to a Mac with USB
2. Open terminal and enter "rvictl -s deviceUUID" to start device with interface rvi0
3. Run wireshark and start capturing the packet on interface rvi0
4. Sotp interface rvi0 by enter "rvictl -x deviceUUID"

PS. deviceUUID is the UUID of your iOS device

Keyboard shortcuts for symbols on Mac OS X

Degree (˚): option + k
Micro (µ): option + m
Copyright (©): option + g
Ohm (Ω): option + z
Registered (®): option + r
Trade mark (™): option + 2

Math:
Approximate (≈): option + x
PI (π): option + p
Delta (∆): option + j

Infinity (∞): option + 5
Division (÷): option + /
Not equal (≠) : option + '+'

Plus/Minus (±): option + shift + =

Square root (√): option + v

Alpha (∂): option + d

Beta (ß): option + s

Function(ƒ): option + f

Calculus (∫): option + b

Money:
Yen (¥): option + y
Pound: (£): option + 3
Euro (€): option + shift + 2

No interface available in Wireshark on Mac OS

Change the permission to 644 on the BFF (Berkeley Packet Filter) in /dev/

sudo chmod 644 /dev/bpf*

or

whoami to find out your name

sudo chown yourname:admin /dev/bp*

And restart wireshark!

Add a private key to Mac OS X KeyChain

ssh-add -K ~/.ssh/id_rsa

ps. make sure the permission of id_rsa is 600

Solution for VPN client not working after upgraded to Mac 10.10 Yosemite

Source: http://apple.stackexchange.com/questions/151345/vpn-client-is-not-working-after-yosemite-update-enforce-firewall-policy-fail

Solution: put computer into kext developer mode (-> 10.9 behavior)
   sudo nvram boot-args="kext-dev-mode=1"

To change back to 10.10 behavior (VPN client will not work)
   sudo nvram -d boot-args


After the change, you need to reboot the computer

Move file for Mac OS

1. Command + C 

2. Option + Command + V

Steps to install OpenCV on Mac OS X for XCode

Reference: http://tilomitra.com/opencv-on-mac-osx/

OpenCV installation steps:
1. Install MacPorts
2. Install CMake by "sudo port install cmake"
3. Get OpenCV source, http://opencv.willowgarage.com/wiki/InstallGuide, and untar it
4. Build OpenCV
   Go to the folder where you untar the OpenCV source to.
   Make a separate folder for building
   . make build
   . cd build
   . cmake -G "Unix Makefiles" ..
   Now make OpenCV
   . make -j8
   . sudo make install
   The OpenCV will be installed to /usr/local
5. Done installing the OpenCV on Mac OS X

Create a sample project on XCode with OpenCV
1. Start a new XCode "Command Line Tool" project with Type C++
2. Add all the libopencv*.dylib (or the ones you need) into the project from /usr/local/lib with "Copy items into destination group's folder (if needed)" checked
3. Add "/usr/local/include" into "Header Search Path" in Build Settings of project
4. Add "/usr/local/lib" into "Library Search Path" in Build Settings of project
5. Either 4.1 or 4.2
   4.1 Select "libstdc++ (GNU C++ standard library)" instead of "libc++ (LLVM C++ standard library with C++11 support)" in "Apple LLVM compiler 4.2 - Language" in Build Settings
   4.2 Select "LLVM GCC 4.2" instead of "Default compiler (Apple LLVM compiler 4.2)" in "Compiler for C/C++/Objective-C" in Build Settings
6. Write some codes to test OpenCV

#include

#include

#include "opencv2/core/core.hpp"

using namespace cv ;

int main(int argc, char** argv)

{

#if 0

    //get the image from the directed path

    IplImage* img = cvLoadImage("/Users/Howard/Desktop/Codes/OpenCV/CV/Lena_512.bmp", 1);

    //NSLog(img);

    //create a window to display the image

    cvNamedWindow("picture", 1);

    //show the image in the window

    cvShowImage("picture", img);

    //wait for the user to hit a key

    cvWaitKey(0);

    //delete the image and window

    cvReleaseImage(&img);

    cvDestroyWindow("picture");

#else

    Mat img = imread("/Users/Howard/Desktop/Codes/OpenCV/CV/Lena_512.bmp",     CV_LOAD_IMAGE_UNCHANGED);

    if (img.data == NULL)

    {

        printf("\n Image cannot be loaded") ;

        system("pause");

        return -1;

    }

    namedWindow("OrgImage", CV_WINDOW_AUTOSIZE);

    imshow("OrgImage", img);

    waitKey(0) ;

#endif

}

7. That's all

Compile x264 for Mac OS X (32bits)

./configure --enable-pic --enable-shared --disable-asm --host=i686-apple-darwin11.1.0 --extra-cflags="-arch i386" --extra-ldflags="-arch i386"

How to check target architecture of a static library

For Mac OS:
   Use lipo.
   Ex. lipo -info staticLibrary.a

For Linux OS:
   Use file
   Ex. file staticLibrary.c

Mac-to-Mac: Remote Desktop (Remote Control)

1. Enable the remote management or screen sharing function on the target Mac which is to be controlled.
. System Preference -> Sharing -> Remote Management
. System Preference -> Sharing -> Screen Sharing

2-A. Apple remote desktop (remote management, not free)
. Start "Remote Desktop"(Install the apple remote desktop admin if it's not installed yet)
. Locate the target Mac and connect to it

2-B. Screen Sharing (free)
. Finder -> Go -> Connect to server
   type in vnc://ip_address_of_the_target_mac

How to compile FFMPEG in 32 bit mode for Mac OS X

./configure --extra-cflags="-arch i386" --extra-ldflags='-arch i386' --arch=x86_32 --target-os=darwin --enable-cross-compile 

My favorite XCode 3 keyboard shortcuts

Keyboard:
. Shift + Option + Command + Left/Rigth arrow key: Move to Previous/Next file
. Command Left/Right arrow key: Go to beginning/end of the line
. Command + [ or ] : Indent selection leftward/rightward
. Command + R : Build and Run (Breakpoints off)
. Command + Y : Build and Debug (Breakpoints on)
. Option + Command + R : Run (Breakpoints off)

. Option + Command + Y : Debug (Breakpoints on)

. Shift + Command + E : Zoom editor out

. Shift + Command + W : Close file

Touchpad:
. 3 fingers swipe up : Switch between .m and .h files
. 3 fingers swipe Left/Right : Go Back/Forward

Environment variable PATH location

Environment variable PATH location: /etc/paths

To export other variable, ie. NDK, adding it to ~/.profile. something like this
export NDK=~/Library/android-ndk-r4b

Or

vi ~/.bashrc
PATH=/opt/crosstool/arm-none-linux-gnueabi-4.4.0_ARMv5TE/bin:$PATH