http://www.celsobarriga.com
Nov
06

Enabling AirDrop on older systems

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You can enable AirDrop for many older Lion systems at the Terminal command line. Enter:

defaults write com.apple.NetworkBrowser BrowseAllInterfaces 1

After setting the defaults, you’ll need to restart Finder:

killall Finder
Categories : Mac OS X
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Sep
13

Ejecting a stuck CD or DVD on a Mac

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If you have a stuck CD or DVD on your Mac, and the desktop icon for the media has disappeared from the desktop so that you can no longer drag it to the trash, you can manually eject the media without rebooting the machine by executing the following command from the Terminal:

drutil tray eject
Categories : Mac OS X
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Aug
13

dyld: shared cached was built against a different libSystem.dylib, ignoring cache

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I just upgraded my MacBook Pro’s hard drive to one with a bigger capacity. After restoring the contents from the old drive to the new one using an image created by SuperDuper!, I keep on getting this error every time I launch the Terminal application:

dyld: shared cached was built against a different libSystem.dylib, ignoring cache

After googling around, I found this discussion thread from Apple’s Support Forum on how to fix the error:
sudo update_dyld_shared_cache -force
Categories : Mac OS X
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Aug
09

Wish you were here!

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… but this is probably the next best thing! :-) Took some panorama shots of the front and back yards today. It’s been a while since I’ve done my last panoramas, so it’s almost like learning from the beginning once again. Anyway, here’s the result and pardon some of the photo misalignments.


Frontyard


Backyard

Note:This requires the Flash Player to view the panoramas. For more information about Flash Player, please visit http://www.macromedia.com/software/flash/about/.If you cannot view the panorama, please download and install the latest version of Flash 10 player.

Categories : General
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May
28

Base64 Encoding and Decoding

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At one time, I needed to encode and decode strings in Base64 but I was on a very old Perl version that does not include the MIME::Base64 core module, nor am I able to install the said module. So, here’s the source for encoding and decoding Base64 ripped from the MIME::Base64 module:

sub EncodeBase64
{
    my $s = shift ;
    my $r = '';
    while( $s =~ /(.{1,45})/gs ){
        chop( $r .= substr(pack("u",$1),1) );
    }
    my $pad=(3-length($s)%3)%3;
    $r =~ tr|` -_|AA-Za-z0-9+/|;
    $r=~s/.{$pad}$/"="x$pad/e if $pad;
    $r=~s/(.{1,72})/$1\n/g;
    $r;
} 

sub DecodeBase64
{
    my $d = shift;
    $d =~ tr!A-Za-z0-9+/!!cd;
    $d =~ s/=+$//;
    $d =~ tr!A-Za-z0-9+/! -_!;
    my $r = '';
    while( $d =~ /(.{1,60})/gs ){
        my $len = chr(32 + length($1)*3/4);
        $r .= unpack("u", $len . $1 );
    }
    $r;
}
Categories : Perl
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May
25

Skydiving video

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Look what I did last weekend! I went for a tandem skydive at Pepperell, MA on May 24th, 2009. What a rush; it was an awesome experience!

See full post to see the movie.
Read More→

Categories : General
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Feb
26

Read string from stdin using fgets

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#include <stdio.h>
#include <string.h>

int main(void)
{
  char str[80];
  int i;

  printf("Enter a string: ");
  fgets(str, 10, stdin);

  /* remove newline, if present */
  i = strlen(str)-1;
  if( str[ i ] == '\n')
      str[i] = '\0';

  printf("This is your string: %s", str);

  return 0;
}
Categories : C
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Feb
01

How to determine DST time changes

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Here’s how to determine the dates when the Daylight Savings Time changes for a given year (I keep forgetting how to do this.):




zdump -v /etc/localtime|grep 2008

/etc/localtime  Sun Mar  9 06:59:59 2008 UTC =
    Sun Mar 9 01:59:59 2008 EST isdst=0 gmtoff=-18000
/etc/localtime  Sun Mar  9 07:00:00 2008 UTC =
    Sun Mar 9 03:00:00 2008 EDT isdst=1 gmtoff=-14400
/etc/localtime  Sun Nov  2 05:59:59 2008 UTC =
    Sun Nov 2 01:59:59 2008 EDT isdst=1 gmtoff=-14400
/etc/localtime  Sun Nov  2 06:00:00 2008 UTC =
    Sun Nov 2 01:00:00 2008 EST isdst=0 gmtoff=-18000

Obviously, change 2008 to whatever year you want.

Categories : Linux, Mac OS X, Notes
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Jan
10

Uninstall Perl Module

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Here's how to cleanly uninstall any Perl module:

#!/usr/local/bin/perl

use ExtUtils::Packlist;
use ExtUtils::Installed;

$ARGV[0] or die "Usage: $0 Module::Name\n";

my $mod = $ARGV[0];

my $inst = ExtUtils::Installed->new();

foreach my $item (sort($inst->files($mod))) {
         print "removing $item\n";
         unlink $item;
}

my $packfile = $inst->packlist($mod)->packlist_file();
print "removing $packfile\n";
unlink $packfile;
Categories : Notes, Perl
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Aug
29

Find Out the Top 10 CPU Hogs

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I found this command useful in finding out which top 10 processes are hogging my CPU resources. Note that this command is specific to the Red Hat flavor of Linux. See the man page for ps for the correct output format to use for your specific platform:

ps -eo pcpu,pid,user,args | sort -k1 -r | head -11

Substitue pcpu above with pmem to see the memory hogs instead.

Categories : Linux, Notes
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