Xah Programing Blog

Syntactic obsession, imperative despisal, unicode love ♥, hacker hate

Xah Programing Blog Archive

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2020-05-29

Intro to Mathematica Pattern Matching for Lisp Programers

2020-05-26

2020-05-25

2020-05-24

Golang: Find String (grep)
minor update

2020-05-24

todo

Am here to ask your money.

Am mostly known for my emacs lisp work in ErgoEmacs and Xah Fly Keys. I also wrote programing language tutorials. Notably JavaScript in Depth at http://xahlee.info/js/js.html and Practical Emacs Lisp at http://ergoemacs.org/emacs/elisp.html

Been doing open source since 1992, in Mathematica code, perl, python, emacs lisp, JavaScript.

If you can give me meals via this github thing, i put my tutorials here so you can access them free. Sans the petty middleman Google Ads.

Now, a poem.

“Reckless of cold and wet and gloom in ease and comfort fain, Laud to the Lord who gives to this, to that denies, his wishes And dooms one toil and catch the prey and other eat the fishes.”

from The Fisherman And The Jinni.

2020-05-24

todo. make nav bax

On Lisp

2020-05-23

Convert Video from Different Formats
minor update

2020-05-23

massive python code at work

Python: Find Replace in a Dir

2020-05-20

much update on PowerShell tutorial

2020-05-17

todo

problems of backup

suppose you have a a big external drive for backup. This drive is connected to your machine via usb3. The question is, how you going to do backup.

one way, is that each weak, you creat a backup folder on the drive, and just copy entire home dir over. So you have something like this on the drive:

backup_2019-12-22
backup_2020-02-16
backup_2020-03-11
backup_2020-03-31
backup_2020-05-17

The problem with this, is that, your dir has hundred thousands of small files. it takes a long time to copy over small files, something 5 or more hours.

another way, is to zip the dir you want to backup, then just copy this one large file over.

It seems to me, this is faster. But, zip file is hard to access. you can't browse them on the backup drive easily, and you have to unzip it if you want to restore files. (you could cherry pick files in a zip archive, but that gets very complex.)

another way, is to use rsync to copy files over. This way, you avoid the problem of copying unchanged files every time. But, you only got 1 version of backup.

another way, is to use git, for at least some directories. For example, i have several git repo that's my website. They have hundred thousand small files, each often less than 1 megabytes. It's difficult to use git for backup, because for each git repo, you have to use a git command. And, what about directories that is not a git repo, such as

Documents
Downloads
Dropbox
Google_Drive
Library

Do you make each a git repo?

or, do you make your entire home dir a git repo? if you make your entire home dir a git repo, you may have problems, because, some of the dir are already a git repo, so you got nested git repo.

2020-05-17

git Frequently Asked Questions
updated.

2020-05-17

Copy Git Repo Dir to USB Drive

todo, work in progress

i have a git repo, of 20k small files. I need to copy it to usb drive. How do i compact the git so it's just few big files, and just copy over the .git dir?

alternative is temp move out the .git then zip the dir so i have 1 single file to copy. But, temp moving .git is tedious. also, zipping is time consuming.

I have a git repo, of tons of small files. I want to copy it to a usb drive. Only 32gb capacity. The problem is, my repo, is over 32gb. Because, having a .git double the size. Because it's the size of the .git plus the dir size. Also, transferring tons of small files is extremely slow. What i want, is some way, to make them 1 single binary file or just a few. So, i can easily copy. So far i do not have easy solution. One solution is, try to compact the git, then, copy over the git. On target i can git checkout. Second solution is, temp move the .git out. Then, either zip or tar gz the dir. This is also very tedious. Plus, either way, it's time consuming to compact git or zip/tar.gz. That's what i want to do.

git bundle

Practical git in 1 Hour

2020-05-17

git archive idiocy

The idiotic git archive command, creates a tar or zip that does not have a parent dir. You get tar bomb when you expand. Fuck the unix idiots

2020-05-17

Git Archive

2020-05-16

todo. review, update. work in progress

File Aliases Considered a Plague

2020-05-14

todo, work in progress

The shape of the circumflex was originally a combination of the acute and grave accents (^), as it marked a syllable contracted from two vowels: an acute-accented vowel and a non-accented vowel (all non-accented syllables in Ancient Greek were once marked with a grave accent).[2][citation needed] Later a variant similar to the tilde (~) was also used.

[2020-05-14 Wikipedia circumflex]

2020-05-14