Category: Tech

Run the following code:

git filter-branch --force --index-filter 'git rm --cached --ignore-unmatch file-path'

Alternatively:

git filter-branch --force --index-filter 'git rm --cached --ignore-unmatch app/views/index.html.erb' --prune-empty --tag-name-filter cat -- --all

Learn more: http://stackoverflow.com/a/23188613

A little bg story: I’m writing a rails app, which is hosted inside the corporate network, and no incoming traffic is permitted. I need to expose the internal port 3000 to the public.

Short answer: SSH forwarding.

$ ssh -R 3000:localhost:3000 [email protected]

For some reason, the forwarding only works when I set both the local and remote port as 3000.

There is one more thing you need to do to enable this. SSH doesn’t by default allow remote hosts to forwarded ports. To enable this open /etc/ssh/sshd_config and add the following line somewhere in that config file.

GatewayPorts yes

Make sure you add it only once!

$ sudo vim /etc/ssh/sshd_config

And restart SSH

$ sudo service ssh restart

Source:
http://blog.trackets.com/2014/05/17/ssh-tunnel-local-and-remote-port-forwarding-explained-with-examples.html
https://help.ubuntu.com/community/SSH/OpenSSH/PortForwarding

So I noticed that my Sony MDR-1RBT is not working on aptX codec, did some searches and here are the steps to get aptX codec capability.

1. Download the io tool:

https://developer.apple.com/downloads/index.action?name=bluetooth%20explorer

2. Bluetooth Explorer -> Tool -> Audio Options: Force use of aptX

3. Reconnect your bluetooth headphone

To enable aptX on the headphone, press volume + and power for two seconds when powering on. The blue indicator will blink 3 times when on aptX mode.

Solution 1: sprintf

/* sprintf example */
#include <stdio.h>

int main ()
{
  char buffer [50];
  int n, a=5, b=3;
  n=sprintf (buffer, "%d plus %d is %d", a, b, a+b);
  printf ("[%s] is a string %d chars long\n",buffer,n);
  return 0;
}

Solution 2: asprintf

/* asprintf example */
#include <stdio.h>

int main ()
{
  char buffer [50];
  int a=5, b=3;
  n=asprintf (&buffer, "%d plus %d is %d", a, b);
  printf ("[%s] is a string\n",buffer);
  return 0;
}

Solution 3:

/* sprintf example */
#include <stdio.h>

int main ()
{
  char buffer [50];
  int n, a=5, b=3;
  n=sprintf (buffer, "%d plus %d is %d", a, b, a+b);
  printf ("[%s] is a string %d chars long\n",buffer,n);
  return 0;
}

It turned out to be caused by receipts inside the hidden location /private/var/db/receipts

delete correspondant files solved the issue