Randomness

Posted by R on October 4, 2016

I am all alone, as I whine
and everything seems fine,
the sun hasn’t lost its shine,
the poems haven’t lost their rhyme,
the music hasn’t lost its chime
the world hasn’t lost its crime
and everyone does look fine.
This is what I always wanted when you were mine…
Why then O dear so I whine ?
I am all alone, no one to bother, No one to answer,
Master of my wishes and time!

I am all alone, as I whine
But if everything does seems fine
Why then O dear do I fright ?
Why is sun no longer bright.
Why is melody no longer in sight
and why does nothing feels right ?

I am all alone, as I whine,
Master of my own time,
but why is the that time stopped ?
Flowers now smell of the rot
and spirit seems wrought
But everything does seem fine.

I am all alone, as I whine,
No soul to talk except mine,
No memories to ponder except thine,

Waiting for the eternal peace,
which I just saw dying…

At.js with froala issue

Posted by R on February 8, 2016

At.js is a Javascript library for having Github like mentions in an app. The library is here. It’s a very good library and simple to use however when I tried it, it didn’t work out of the box for froala editor. The problem is At.js surrounds the range with spans and since WebKit browsers insert spans, the editor accepts spans only if

data-fr-verified=”true”

is set to true. So to counter this, when initiating the function, a small tweak is required.

$(‘.froala-view’).atwho({
at: “@”,
editableAtwhoQueryAttrs: {“data-fr-verified”: true},

data:[‘Peter’, ‘Tom’, ‘Anne’]
})

This should get it working as it did for me.

Reference: Github issue

Hope it helps

Screen shot in Chrome Extension

Posted by R on January 29, 2016

Hi,
There are many chrome extensions to take a screenshot. But recently, I was working on a project where we had to build an extension and also were taking a screenshot. So apparently, chrome provides an API called ‘capturevisibletab’ (doc) and it works. While coding, I referred to this git repo which works perfectly.
But then, as we tested, we found the image was cropped when using a macbook retina display machine.
It took us a while to understand that this is because the devicepixelratio (window.devicePixelRatio) is 2 in a macbook(with retina) display and 1 in others and hence the issue.
Thus, we had to adjust for scale which we did not account for earlier and we referred to this code for adjusting it.

Will soon post our whole code for completeness but the logic is pretty clear from the above code.

Hope it helps !

Modifying the “PATH” variable in MAC

Posted by R on December 2, 2014

This is probably the most important thing one can do in a UNIX based system- Modify the PATH variable.

I recently installed Libreoffice on my mac for using its command line tools. It was working fine in the applications folder and showing up on spotlight as well as dock but the command line tool was not working

After some time , I figured that in Linux, I used “libreoffice ….” but in Mac I had to use “soffice…”. soffice command was not directly available to me on terminal and I had to specify the whole path to use it:

/Applications/LibreOffice.app/Contents/MacOS/soffice –help

To use soffice without the whole path, I modified my PATH variable :

nano ~/.bash_profile

(create this file using touch ~/.bash_profile if your system doesn’t have one!!)

Include the lines:

export PATH=”/Applications/LibreOffice.app/Contents/MacOS:$PATH”

Save it and enter the command:

source ~/.bash_profile

And wallah ! The Path variable is modified and we can now use soffice directly in command line.

soffice –help

This way, we can include any application in command line.

Hope it helps.

SSH login without passwords

Posted by R on April 2, 2014

We all use ssh logins for server. May be production servers and may be deployment servers. We are all used to login using passwords but if we have many servers , remembering all passwords might be an issue. Hence, for ease of use, a small thing we can do is login to our servers without passwords. The logic behind this is putting in public keys for authorized users in .ssh/authorized_keys file.

This might help in security as well because the admin can do this procedure and authorize/ de-authorize a system from accessing the server. The passwords will remain only with admin and his/her team and hence risk of password leaking is less!

Step 1: Generate a public key:

ssh-keygen -t rsa

Step 2: Copy the public key
The public key is by default stored in ~/.ssh/id_rsa.pub file Open this file in your favourite editor and copy the key.

You can also use xclip for this.

Step 3: Login to your server
ssh username@servername

Step 4: Paste the key in ~/.ssh/authorized_keys file.
A single line command to do this:

cat .ssh/id_rsa.pub | ssh username@server 'cat >> .ssh/authorized_keys'

This should do the trick!

Hope it helps!

WiFi issues on Ubuntu 12.04

Posted by R on April 2, 2014

Hey ,

Recently installed ubuntu 12.04 on a fresh and clean system. While it works like a charm, a very irritating issue was that the inbuilt wireless card was not working. The ethernet connection using wire worked fine. Googled a lot and wasnt able to figure things out. Finally, backports saved my day. Here is the procedure I followed incase someone finds it useful.

Installing backports:

sudo apt-get install  linux-backports-modules-cw-3.8-precise-generic

Some generic headers and libraries:

sudo apt-get install linux-headers-generic build-essential

Download this file and extract it at a location of your choice.
Navigate to the extracted directory using terminal and try:

make defconfig-ath9k
make
sudo make install

Reboot the system and ideally wireless should work!

Hope it helps.

Guake – Annoying feature of renaming tabs

Posted by R on December 7, 2013

I am a huge fan of guake terminal and after having used it for quite a while, I am literally addicted to it.

Recently, I encountered a very annoying feature which is when I rename a tab and perform any operation on that tab, the name I gave disappears and the absolute path is shown.

This was very painful because I am used to work with multiple tabs open and naming helps navigation.

After some googling, I found a solution which I present below.

Install gconf-editor.

sudo apt-get install gconf-editor

Start gcong-editor

gconf-editor

Browse to apps/general/guake/general.

On the right hand side, uncheck the “use_vte_titles” item and close it and restart guake.

All tabs would be named “Terminal” and renaming would preserve it.

The technical reason for doing this is the following piece of code:

def on_terminal_title_changed(self, vte, box):
    use_them = self.client.get_bool(KEY("/general/use_vte_titles"))
    if not use_them:
        return
    page = self.notebook.page_num(box)
    self.tabs.get_children()[page].set_label(vte.get_window_title())

As we can see ‘use_vte_titles' key prevents the autorenaming feature

Hope this helps and enjoy using guake.

Editing a form in nested_form gem

Posted by R on January 19, 2013

This is a very very naive and simple thing but I quite lost my time on this so I thought might be helpful.

Recently I was using the ‘nested_form’ gem by the great Ryan Bates (https://github.com/ryanb/nested_form). The form to create a new form works like a real gem without any effort.

Now, when I clicked on ‘edit’ link, it created some issues as the nested models didnt come.

I had a simple thing like each question has many answers. When I created a question, I added 5 answers to it but when I edited the question, no answers were visible.

The simple solution for this would be that the <% f.fields_for :answers do |an| %> line in your form would be without an equal to sign so just add it.

Thus, it looks like

<%= f.fields_for :answers do |an| %>

Thats all and it works like a charm!

Hope it helps.

Fixing Ubuntu GPG BADSIG error

Posted by R on September 28, 2012

Recently, I faced a error while updating my Ubuntu system.

When I ran “sudo apt-get update”,

it gave me the followinf error message:

W: GPG error: http://archive.canonical.com intrepid Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key

The way I fixed it was:

$ sudo -i

# apt-get clean

# cd /var/lib/apt

# mv lists lists.old

# mkdir -p lists/partial

# apt-get clean

# apt-get update

Hope it helps. !!

Western european special characters and how to enter them from your keyboard

Posted by R on August 9, 2012

HTML Name Code	HTML Number Code	Glyph	MacOS	Windows	Description
‘	‘	‘	option+]	Alt+0145	left single quote
’	’	’	shift+option+]	Alt+0146	right single quote
&sbquo;	‚	‚			single low-9 quote
“	“	“	option+[	Alt+0147	left double quote
”	”	”	shift+option+[	Alt+0148	right double quote
&bdquo;	„	„	shift+option+w		double low-9 quote
&dagger;	†	†	option+t	Alt+0134	dagger
&Dagger;	‡	‡	shift+option+7	Alt+0135	double dagger
	…	…	option+;		horizontal ellipsis
&permil;	‰	‰	shift+option+r	Alt+0137	per mill sign
&lsaquo;	‹	‹	shift+option+3	Alt+0139	single left-pointing angle quote
&rsaquo;	›	›	shift+option+4	Alt+0155	single right-pointing angle quote
&spades;	♠	♠			black spade suit
&clubs;	♣	♣			black club suit
&hearts;	♥	♥			black heart suit
&diams;	♦	♦			black diamond suit
&oline;	‾	‾			overline, = spacing overscore
←	←	←			leftward arrow
↑	↑	↑			upward arrow
→	→	→			rightward arrow
↓	↓	↓			downward arrow
™	™	™	option+2	Alt+0153	trademark sign
"	"	“			double quotation mark
&	&	&			ampersand
<	<	<			less-than sign
>	>	>			greater-than sign
	[	[			left square bracket
	]	]			right square bracket
–	–	–	option+hyphen	Alt+0150	en dash
—	—	—	shift+option+hyphen	Alt+0151	em dash
				Alt+0160	nonbreaking space
¡	¡	¡	option+1	Alt+0161	inverted exclamation
¢	¢	¢	option+4	Alt+0162	cent sign
£	£	£	option+3	Alt+0163	pound sterling
¤	¤	¤		Alt+0164	general currency sign
¥	¥	¥	option+y	Alt+0165	yen sign
¦ or &brkbar;	¦	¦		Alt+0166	broken vertical bar
§	§	§	option+6	Alt+0167	section sign
¨ or &die;	¨	¨	shift+option+u	Alt+0168	umlaut
©	©	©	option+g	Alt+0169	copyright
ª	ª	ª	option+9	Alt+0170	feminine ordinal
«	«	«	option+\	Alt+0171	left angle quote
¬	¬	¬	option+l	Alt+0172	not sign
				Alt+0173	soft hyphen
®	®	®	option+r	Alt+0174	registered trademark
¯ or &hibar;	¯	¯		Alt+0175	macron accent
°	°	°	shift+option+8	Alt+0176	degree sign
±	±	±	shift+option+=	Alt+0177	plus or minus
²	²	²		Alt+0178	superscript two
³	³	³		Alt+0179	superscript three
´	´	´	shift+option+e	Alt+0180	acute accent
µ	µ	µ	option+m	Alt+0181	micro sign
¶	¶	¶	option+7	Alt+0182	paragraph sign
·	·	·	shift+option+9	Alt+0183	middle dot
¸	¸	¸	shift+option+z	Alt+0184	cedilla
¹	¹	¹		Alt+0185	superscript one
º	º	º	option+0	Alt+0186	masculine ordinal
»	»	»	shift+option+\	Alt+0187	right angle quote
¼	¼	¼		Alt+0188	one-fourth
½	½	½		Alt+0189	one-half
¾	¾	¾		Alt+0190	three-fourths
¿	¿	¿	shift+option+?	Alt+0191	inverted question mark
À	À	À	option+` A	Alt+0192	uppercase A, grave accent
Á	Á	Á	option+e A	Alt+0193	uppercase A, acute accent
Â	Â	Â	option+i A	Alt+0194	uppercase A, circumflex accent
Ã	Ã	Ã	option+n A	Alt+0195	uppercase A, tilde
Ä	Ä	Ä	option+u A	Alt+0196	uppercase A, umlaut
Å	Å	Å	shift+option+a	Alt+0197	uppercase A, ring
Æ	Æ	Æ	shift+option+’	Alt+0198	uppercase AE
Ç	Ç	Ç	shift+option+c	Alt+0199	uppercase C, cedilla
È	È	È	option+` E	Alt+0200	uppercase E, grave accent
É	É	É	option+e E	Alt+0201	uppercase E, acute accent
Ê	Ê	Ê	option+i E	Alt+0202	uppercase E, circumflex accent
Ë	Ë	Ë	option+u E	Alt+0203	uppercase E, umlaut
Ì	Ì	Ì	option+` I	Alt+0204	uppercase I, grave accent
Í	Í	Í	option+e I	Alt+0205	uppercase I, acute accent
Î	Î	Î	option+i I	Alt+0206	uppercase I, circumflex accent
Ï	Ï	Ï	option+u I	Alt+0207	uppercase I, umlaut
Ð	Ð	Ð		Alt+0208	uppercase Eth, Icelandic
Ñ	Ñ	Ñ	option+n N	Alt+0209	uppercase N, tilde
Ò	Ò	Ò	option+` O	Alt+0210	uppercase O, grave accent
Ó	Ó	Ó	option+e O	Alt+0211	uppercase O, acute accent
Ô	Ô	Ô	option+i O	Alt+0212	uppercase O, circumflex accent
Õ	Õ	Õ	option+n O	Alt+0213	uppercase O, tilde
Ö	Ö	Ö	option+u O	Alt+0214	uppercase O, umlaut
×	×	×		Alt+0215	multiplication sign
Ø	Ø	Ø	shift+option+o	Alt+0216	uppercase O, slash
Ù	Ù	Ù	option+` U	Alt+0217	uppercase U, grave accent
Ú	Ú	Ú	option+e U	Alt+0218	uppercase U, acute accent
Û	Û	Û	option+i U	Alt+0219	uppercase U, circumflex accent
Ü	Ü	Ü	option+u U	Alt+0220	uppercase U, umlaut
Ý	Ý	Ý		Alt+0221	uppercase Y, acute accent
Þ	Þ	Þ		Alt+0222	uppercase THORN, Icelandic
ß	ß	ß	option+s	Alt+0223	lowercase sharps, German
à	à	à	option+` a	Alt+0224	lowercase a, grave accent
á	á	á	option+e a	Alt+0225	lowercase a, acute accent
â	â	â	option+i a	Alt+0226	lowercase a, circumflex accent
ã	ã	ã	option+n a	Alt+0227	lowercase a, tilde
ä	ä	ä	option+u a	Alt+0228	lowercase a, umlaut
å	å	å	option+a	Alt+0229	lowercase a, ring
æ	æ	æ	option+’	Alt+0230	lowercase ae
ç	ç	ç	option+c	Alt+0231	lowercase c, cedilla
è	è	è	option+` e	Alt+0232	lowercase e, grave accent
é	é	é	option+e e	Alt+0233	lowercase e, acute accent
ê	ê	ê	option+i e	Alt+0234	lowercase e, circumflex accent
ë	ë	ë	option+u e	Alt+0235	lowercase e, umlaut
ì	ì	ì	option+` i	Alt+0236	lowercase i, grave accent
í	í	í	option+e i	Alt+0237	lowercase i, acute accent
î	î	î	option+i i	Alt+0238	lowercase i, circumflex accent
ï	ï	ï	option+u i	Alt+0239	lowercase i, umlaut
ð	ð	ð		Alt+0240	lowercase eth, Icelandic
ñ	ñ	ñ	option+n n	Alt+0241	lowercase n, tilde
ò	ò	ò	option+` o	Alt+0242	lowercase o, grave accent
ó	ó	ó	option+e o	Alt+0243	lowercase o, acute accent
ô	ô	ô	option+i o	Alt+0244	lowercase o, circumflex accent
õ	õ	õ	option+n o	Alt+0245	lowercase o, tilde
ö	ö	ö	option+u o	Alt+0246	lowercase o, umlaut
÷	÷	÷		Alt+0247	division sign
ø	ø	ø	option+o	Alt+0248	lowercase o, slash
ù	ù	ù	option+` u	Alt+0249	lowercase u, grave accent
ú	ú	ú	option+e u	Alt+0250	lowercase u, acute accent
û	û	û	option+i u	Alt+0251	lowercase u, circumflex accent
ü	ü	ü	option+u u	Alt+0252	lowercase u, umlaut
ý	ý	ý		Alt+0253	lowercase y, acute accent
þ	þ	þ		Alt+0254	lowercase thorn, Icelandic
ÿ	ÿ	ÿ	option+u y	Alt+0255	lowercase y, umlaut

Rushabh Ajay Hathi

The world where "IMPOSSIBLE" is spelt "I M POSSIBLE" !!!

Category Archives: General Computing

Randomness

At.js with froala issue

Screen shot in Chrome Extension

Modifying the “PATH” variable in MAC

WiFi issues on Ubuntu 12.04

Guake – Annoying feature of renaming tabs

Editing a form in nested_form gem

Fixing Ubuntu GPG BADSIG error

Western european special characters and how to enter them from your keyboard