Back when this mistake was made, There was only one Phone Company, because they hadn't been broken up yet. Ted Bundy was still on the loose. Babe Ruth's home run record was about to fall.
It is 2018 and this error message is a mistake from 1974.
This limitation, which is still found in the very latest Windows 10, dates back to BEFORE STAR WARS. This bug is as old as Watergate.
Back when this mistake was made, There was only one Phone Company, because they hadn't been broken up yet. Ted Bundy was still on the loose. Babe Ruth's home run record was about to fall.
You could do neat things with it like copy data off the serial port into a text file, or print a textfile right from the command line!
You can get infinite zeros from /dev/zero, random bytes from /dev/random, etc!
So directories? you don't need 'em. Instead of directories, you just use different disks.
So they're just "everywhere", effectively.
So if you have FOO.TXT and need to print it, you can do "PIP LST:=FOO.TXT" which copies foo.txt to the "file" LST, which is the printer.
but what about extensions? Here's the problem: programs like to name their files with the right extension.
but the program might try to put .TXT on the end of your filename! LST.TXT isn't the printer, right?
Eh. It's a hack, but it works, and this is just on some little microcomputers with 4k of ram, who cares?
But it was big, so naturally IBM wanted it for some "PC" project they were doing in early 1980
MS purchased Tim Paterson's project and developed it into PC-DOS (which later became MS-DOS, if you're not aware)
It was definitely inspired by CP/M, in a lot of ways.
So QDOS and PC-DOS 1.0 have AUX, PRN, CON, LPT, etc, too!
You need them to keep your massive 10mb hard drive organized, obviously!
with directories, Microsoft could now make a C:\DEV folder... but they didn't.
Special files are in EVERY DIRECTORY with EVERY EXTENSION.
So your "DIR > LPT" trick to print the directory listing doesn't break because you're in C:\DOS instead of A:\
And when Windows 95 was released, it was built on top of DOS. So it naturally inherited this behavior. (Windows 1/2/3 similarly did, but Win95 was much more an OS than they were)
But Windows NT wanted compatibility with DOS/Windows programs. And XP merged the two lines.
So these special files still work, FORTY FOUR FUCKING YEARS LATER
aux.txt
prn.txt
it'll tell you NOPE
CON, PRN, AUX, NUL, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, and LPT9
https://t.co/1eYQVBKO65
These special-device names are implemented at the OS level, rather than the filesystem level. So they're perfectly valid NTFS filenames, and I was using an NTFS drive in linux.
A couple follow ups:
1. The CP/M inventor's name is "Gary Kildall", not "Gary Kiddal".
Sorry, I posted this at 5am after being in the hospital for like... 8 hours?
It actually required them to be followed by a colon, as if they were a drive name.
So PRN: is the printer, PRN is not.
I didn't mean to imply CP/M did, just DOS, but I don't think I made this clear
PC DOS 1 did support copying to/from special files though, so my general point was correct, even if my example was confusing
It's like you're living on a space station and get trampled by a horse.
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I think about this a lot, both in IT and civil infrastructure. It looks so trivial to “fix” from the outside. In fact, it is incredibly draining to do the entirely crushing work of real policy changes internally. It’s harder than drafting a blank page of how the world should be.
I’m at a sort of career crisis point. In my job before, three people could contain the entire complexity of a nation-wide company’s IT infrastructure in their head.
Once you move above that mark, it becomes exponentially, far and away beyond anything I dreamed, more difficult.
And I look at candidates and know-everything’s who think it’s all so easy. Or, people who think we could burn it down with no losses and start over.
God I wish I lived in that world of triviality. In moments, I find myself regretting leaving that place of self-directed autonomy.
For ten years I knew I could build something and see results that same day. Now I’m adjusting to building something in my mind in one day, and it taking a year to do the due-diligence and edge cases and documentation and familiarization and roll-out.
That’s the hard work. It’s not technical. It’s not becoming a rockstar to peers.
These people look at me and just see another self-important idiot in Security who thinks they understand the system others live. Who thinks “bad” designs were made for no reason.
Who wasn’t there.
The tragedy of revolutionaries is they design a utopia by a river but discover the impure city they razed was on stilts for a reason.
— SwiftOnSecurity (@SwiftOnSecurity) June 19, 2016
I’m at a sort of career crisis point. In my job before, three people could contain the entire complexity of a nation-wide company’s IT infrastructure in their head.
Once you move above that mark, it becomes exponentially, far and away beyond anything I dreamed, more difficult.
And I look at candidates and know-everything’s who think it’s all so easy. Or, people who think we could burn it down with no losses and start over.
God I wish I lived in that world of triviality. In moments, I find myself regretting leaving that place of self-directed autonomy.
For ten years I knew I could build something and see results that same day. Now I’m adjusting to building something in my mind in one day, and it taking a year to do the due-diligence and edge cases and documentation and familiarization and roll-out.
That’s the hard work. It’s not technical. It’s not becoming a rockstar to peers.
These people look at me and just see another self-important idiot in Security who thinks they understand the system others live. Who thinks “bad” designs were made for no reason.
Who wasn’t there.
THREAD: How is it possible to train a well-performing, advanced Computer Vision model 𝗼𝗻 𝘁𝗵𝗲 𝗖𝗣𝗨? 🤔
At the heart of this lies the most important technique in modern deep learning - transfer learning.
Let's analyze how it
2/ For starters, let's look at what a neural network (NN for short) does.
An NN is like a stack of pancakes, with computation flowing up when we make predictions.
How does it all work?
3/ We show an image to our model.
An image is a collection of pixels. Each pixel is just a bunch of numbers describing its color.
Here is what it might look like for a black and white image
4/ The picture goes into the layer at the bottom.
Each layer performs computation on the image, transforming it and passing it upwards.
5/ By the time the image reaches the uppermost layer, it has been transformed to the point that it now consists of two numbers only.
The outputs of a layer are called activations, and the outputs of the last layer have a special meaning... they are the predictions!
At the heart of this lies the most important technique in modern deep learning - transfer learning.
Let's analyze how it
THREAD: Can you start learning cutting-edge deep learning without specialized hardware? \U0001f916
— Radek Osmulski (@radekosmulski) February 11, 2021
In this thread, we will train an advanced Computer Vision model on a challenging dataset. \U0001f415\U0001f408 Training completes in 25 minutes on my 3yrs old Ryzen 5 CPU.
Let me show you how...
2/ For starters, let's look at what a neural network (NN for short) does.
An NN is like a stack of pancakes, with computation flowing up when we make predictions.
How does it all work?
3/ We show an image to our model.
An image is a collection of pixels. Each pixel is just a bunch of numbers describing its color.
Here is what it might look like for a black and white image
4/ The picture goes into the layer at the bottom.
Each layer performs computation on the image, transforming it and passing it upwards.
5/ By the time the image reaches the uppermost layer, it has been transformed to the point that it now consists of two numbers only.
The outputs of a layer are called activations, and the outputs of the last layer have a special meaning... they are the predictions!
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#ஆதித்தியஹ்ருதயம் ஸ்தோத்திரம்
இது சூரிய குலத்தில் உதித்த இராமபிரானுக்கு தமிழ் முனிவர் அகத்தியர் உபதேசித்ததாக வால்மீகி இராமாயணத்தில் வருகிறது. ஆதித்ய ஹ்ருதயத்தைத் தினமும் ஓதினால் பெரும் பயன் பெறலாம் என மகான்களும் ஞானிகளும் காலம் காலமாகக் கூறி வருகின்றனர். ராம-ராவண யுத்தத்தை
தேவர்களுடன் சேர்ந்து பார்க்க வந்திருந்த அகத்தியர், அப்போது போரினால் களைத்து, கவலையுடன் காணப்பட்ட ராமபிரானை அணுகி, மனிதர்களிலேயே சிறந்தவனான ராமா போரில் எந்த மந்திரத்தைப் பாராயணம் செய்தால் எல்லா பகைவர்களையும் வெல்ல முடியுமோ அந்த ரகசிய மந்திரத்தை, வேதத்தில் சொல்லப்பட்டுள்ளதை உனக்கு
நான் உபதேசிக்கிறேன், கேள் என்று கூறி உபதேசித்தார். முதல் இரு சுலோகங்கள் சூழ்நிலையை விவரிக்கின்றன. மூன்றாவது சுலோகம் அகத்தியர் இராமபிரானை விளித்துக் கூறுவதாக அமைந்திருக்கிறது. நான்காவது சுலோகம் முதல் முப்பதாம் சுலோகம் வரை ஆதித்ய ஹ்ருதயம் என்னும் நூல். முப்பத்தி ஒன்றாம் சுலோகம்
இந்தத் துதியால் மகிழ்ந்த சூரியன் இராமனை வாழ்த்துவதைக் கூறுவதாக அமைந்திருக்கிறது.
ஐந்தாவது ஸ்லோகம்:
ஸர்வ மங்கள் மாங்கல்யம் ஸர்வ பாப ப்ரநாசனம்
சிந்தா சோக ப்ரசமனம் ஆயுர் வர்த்தனம் உத்தமம்
பொருள்: இந்த அதித்ய ஹ்ருதயம் என்ற துதி மங்களங்களில் சிறந்தது, பாவங்களையும் கவலைகளையும்
குழப்பங்களையும் நீக்குவது, வாழ்நாளை நீட்டிப்பது, மிகவும் சிறந்தது. இதயத்தில் வசிக்கும் பகவானுடைய அனுக்ரகத்தை அளிப்பதாகும்.
முழு ஸ்லோக லிங்க் பொருளுடன் இங்கே உள்ளது https://t.co/Q3qm1TfPmk
சூரியன் உலக இயக்கத்திற்கு மிக முக்கியமானவர். சூரிய சக்தியால்தான் ஜீவராசிகள், பயிர்கள்
இது சூரிய குலத்தில் உதித்த இராமபிரானுக்கு தமிழ் முனிவர் அகத்தியர் உபதேசித்ததாக வால்மீகி இராமாயணத்தில் வருகிறது. ஆதித்ய ஹ்ருதயத்தைத் தினமும் ஓதினால் பெரும் பயன் பெறலாம் என மகான்களும் ஞானிகளும் காலம் காலமாகக் கூறி வருகின்றனர். ராம-ராவண யுத்தத்தை
தேவர்களுடன் சேர்ந்து பார்க்க வந்திருந்த அகத்தியர், அப்போது போரினால் களைத்து, கவலையுடன் காணப்பட்ட ராமபிரானை அணுகி, மனிதர்களிலேயே சிறந்தவனான ராமா போரில் எந்த மந்திரத்தைப் பாராயணம் செய்தால் எல்லா பகைவர்களையும் வெல்ல முடியுமோ அந்த ரகசிய மந்திரத்தை, வேதத்தில் சொல்லப்பட்டுள்ளதை உனக்கு
நான் உபதேசிக்கிறேன், கேள் என்று கூறி உபதேசித்தார். முதல் இரு சுலோகங்கள் சூழ்நிலையை விவரிக்கின்றன. மூன்றாவது சுலோகம் அகத்தியர் இராமபிரானை விளித்துக் கூறுவதாக அமைந்திருக்கிறது. நான்காவது சுலோகம் முதல் முப்பதாம் சுலோகம் வரை ஆதித்ய ஹ்ருதயம் என்னும் நூல். முப்பத்தி ஒன்றாம் சுலோகம்
இந்தத் துதியால் மகிழ்ந்த சூரியன் இராமனை வாழ்த்துவதைக் கூறுவதாக அமைந்திருக்கிறது.
ஐந்தாவது ஸ்லோகம்:
ஸர்வ மங்கள் மாங்கல்யம் ஸர்வ பாப ப்ரநாசனம்
சிந்தா சோக ப்ரசமனம் ஆயுர் வர்த்தனம் உத்தமம்
பொருள்: இந்த அதித்ய ஹ்ருதயம் என்ற துதி மங்களங்களில் சிறந்தது, பாவங்களையும் கவலைகளையும்
குழப்பங்களையும் நீக்குவது, வாழ்நாளை நீட்டிப்பது, மிகவும் சிறந்தது. இதயத்தில் வசிக்கும் பகவானுடைய அனுக்ரகத்தை அளிப்பதாகும்.
முழு ஸ்லோக லிங்க் பொருளுடன் இங்கே உள்ளது https://t.co/Q3qm1TfPmk
சூரியன் உலக இயக்கத்திற்கு மிக முக்கியமானவர். சூரிய சக்தியால்தான் ஜீவராசிகள், பயிர்கள்
A brief analysis and comparison of the CSS for Twitter's PWA vs Twitter's legacy desktop website. The difference is dramatic and I'll touch on some reasons why.
Legacy site *downloads* ~630 KB CSS per theme and writing direction.
6,769 rules
9,252 selectors
16.7k declarations
3,370 unique declarations
44 media queries
36 unique colors
50 unique background colors
46 unique font sizes
39 unique z-indices
https://t.co/qyl4Bt1i5x
PWA *incrementally generates* ~30 KB CSS that handles all themes and writing directions.
735 rules
740 selectors
757 declarations
730 unique declarations
0 media queries
11 unique colors
32 unique background colors
15 unique font sizes
7 unique z-indices
https://t.co/w7oNG5KUkJ
The legacy site's CSS is what happens when hundreds of people directly write CSS over many years. Specificity wars, redundancy, a house of cards that can't be fixed. The result is extremely inefficient and error-prone styling that punishes users and developers.
The PWA's CSS is generated on-demand by a JS framework that manages styles and outputs "atomic CSS". The framework can enforce strict constraints and perform optimisations, which is why the CSS is so much smaller and safer. Style conflicts and unbounded CSS growth are avoided.
Legacy site *downloads* ~630 KB CSS per theme and writing direction.
6,769 rules
9,252 selectors
16.7k declarations
3,370 unique declarations
44 media queries
36 unique colors
50 unique background colors
46 unique font sizes
39 unique z-indices
https://t.co/qyl4Bt1i5x
PWA *incrementally generates* ~30 KB CSS that handles all themes and writing directions.
735 rules
740 selectors
757 declarations
730 unique declarations
0 media queries
11 unique colors
32 unique background colors
15 unique font sizes
7 unique z-indices
https://t.co/w7oNG5KUkJ
The legacy site's CSS is what happens when hundreds of people directly write CSS over many years. Specificity wars, redundancy, a house of cards that can't be fixed. The result is extremely inefficient and error-prone styling that punishes users and developers.
The PWA's CSS is generated on-demand by a JS framework that manages styles and outputs "atomic CSS". The framework can enforce strict constraints and perform optimisations, which is why the CSS is so much smaller and safer. Style conflicts and unbounded CSS growth are avoided.
