26 Apr 2020 @ 2:51 PM 

I had to delete ~1.700.000 files in a Magento var/session/ folder

  • the Plesk interface crashed after a few minutes because it didn’t have the memory to list the folder’s content
  • after ssh-ing into the machine, the classic rm -rf var/session/* also crashed afeter a few minutes with the error: ” -sh: /usr/bin/rm: Argument list too long”

So I started looking on other solutions on the wild web and I came to this Kinamo post: Efficiently delete a million files on Linux servers that had 4 variants:

  • `-sh-4.2$ rm -rf var/session/*` -> -sh: /usr/bin/rm: Argument list too long
  • `find /yourmagicmap/* -type f -mtime +3 -exec rm -f {} \;`
  • `find /yourmagicmap/* -type f -mtime +3 -delete`
  • `-sh-4.2$ rsync -a –delete /tmp/empty/ var/session/`

Details on those variants:

  • rm: deleting millions of file is a no-can-do!
  • find -exec: an option, but slower!
  • find -delete: fast and easy way to remove loads of files.
  • rsync –delete: without doubt the quickest!

Beside that post, I found another solution proposed on a Unix StackExchange thread: Faster way to delete large number of files [duplicate] which had answers on another one: Efficiently delete large directory containing thousands of files. The solution was a delete-in-5000-files-batches script:

#!/bin/bash

# Path to folder with many files
FOLDER="/path/to/folder/with/many/files"

# Temporary file to store file names
FILE_FILENAMES="/tmp/filenames"

if [ -z "$FOLDER" ]; then
    echo "Prevented you from deleting everything! Correct your FOLDER variable!"
    exit 1
fi

while true; do
    FILES=$(ls -f1 $FOLDER | wc -l)
    if [ "$FILES" -gt 10000 ]; then
        printf "[%s] %s files found. going on with removing\n" "$(date)" "$FILES"
        # Create new list of files
        ls -f1 $FOLDER | head -n 5002 | tail -n 5000 > "$FILE_FILENAMES"

        if [ -s $FILE_FILENAMES ]; then
            while read FILE; do
                rm "$FOLDER/$FILE"
                sleep 0.005
            done < "$FILE_FILENAMES"
        fi
    else
        printf "[%s] script has finished, almost all files have been deleted" "$(date)"
        break
    fi
    sleep 5
done

 

Stats for my test:

  • batch-delete-script: 5000 files / 43 seconds -> ~100 files/s
  • rsync: 50.000 files / 6 seconds -> 8300 files/s !!

Obviously, the rsync is the fastest solution for deleting a huge number of files!

 


PS. There was another solution on one of the stackexchange threads above, that claimed that a Perl one-liner would be even faster:

perl -e 'for(<*>){((stat)[9]<(unlink))}'

(I didn’t have the chance to test it though, because I already deleted the files.)

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Posted By: Teodor Muraru
Last Edit: 26 Apr 2020 @ 03:08 PM

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Categories: Linux, Technology
 25 Sep 2017 @ 8:44 PM 

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Posted By: Teodor Muraru
Last Edit: 25 Sep 2017 @ 09:02 PM

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 13 Jan 2013 @ 2:46 PM 

I had a problem with viewing/editing a 370 Mb SQL file in Windows (7) on a machine with 4GB of RAM.

I searched some solutions:

Common candidates:

  • Notepad++, Notepad, Wordpad
  • SublimeText – my personal favorite (it surpassed Notepad++ in 2011 when I first read about it)
  • TextPad, UltraEdit, EditPlus (v3)
  • TheGun (“For 6k in file size, it is fully drag and drop enabled, it supports wordwrap and it has a separate accessory to change some of the startup settings. TheGun does not use any additional runtime DLLs and is coded in Microsoft Assembler (MASM) using the Windows API functions. TheGun does not have an effective file size limit and the maximum size that can be loaded into it is determined by available memory and loading speed of the file.”)
  •  Programmer’s File Editor
  • gVim (a port of vim for Windows), Cream (a wrapper/configuration editor over gVim)
  • some usual programming IDEs: PHPStorm – my personal favorite (it surpassed NetBeans in 2012), Netbeans, Eclipse – they all failed miserably 🙂
  • Large Text File Viewer 5.2 (its last What’s new record was on 6/5/2009)
  • SlickEdit, 010 Editor, PilotEdit;
  • VEdit

Results:

  • Notepad++ (6MB kit/portable, open-source) – memory: 6MB at start, 785MB when editing, open in ~5 seconds, save in ~4 seconds, search in 6-11 seconds, instant edit/undo/redovery fluid when navigating inside the file (after an initial pause ~38 seconds); But, sometimes it won’t open it (Error: the file is too big)
  • SublimeText2 (6MB kit/portable, evaluation version – 30 days) – works, but VERY sluggish on all operations: open, find, save, undo; memory: 18MB at start, 2GB when editing,
  • Programmer’s File Editor (650K portable, open-source) – memory: 7MB at start, 420MB when editing, open/save in ~10 seconds, search in 2-3 seconds, instant edit/undo/redovery fluid when navigating inside the file; But: it said it cropped too long lines, which is kind of unacceptable (maybe there are settings to avoid it, but I tried the solution just as-it-was)
  • Large Text File Viewer 5.2 (500K portable, open-source) – memory: 1.5MB at start, 5MB when viewing, open in ~10 seconds, search > 150 seconds, NO edit/undo/redovery fluid when navigating inside the fileOnly viewer, no editor;  NO syntax highlighting;
  • TheGun (6K portable, open-source) – memory: 1.5MB at start, 792MB when viewing, open in ~20 seconds, save in ~10 seconds, search in 2-3 seconds, instant edit/undo/redo, very fluid when navigating inside the fileNO syntax highlighting;
  • Cream [gVim] (8MB kit, open-source) – memory: 4.5MB at start, 420MB when viewing, open in ~4 seconds, save in ~10 seconds, search in 2-3 seconds, instant edit/undo/redosluggish when moving inside the fileNO syntax highlighting;
  • TextPad (4MB kit, evaluation version – 30 days) – memory: 4MB at start, 22-26MB when editing, open in ~22 seconds, save in ~4 seconds, search in 1 second, instant edit/undo/redovery fluid when navigating inside the file; But it has a start warning about converting unknown characters to the system default code page 1252 (though it keeps its UTF-8 character set and saves it the same); NO syntax highlighting;
  • UltraEdit (33MB kit, trial version – 30 days) – memory: 19MB at start, 22-29MB when editing, open/save in ~10 seconds, search in ~5 seconds, instant edit/undo/redo, sluggish when moving inside the fileNO syntax highlighting;
  • EditPlus 3 (2MB kit, evaluation version – 30 days) –  won’t open it: “Out of memory”, Warning at opening: File is too large (recommends max file size: 323MB)
  • SlickEdit ( 78MB kit, trial version – 30 days) – memory: 54MB at start, 795MB when editing, open instantlysave in ~3 seconds, search in 1 second, instant edit, NO undo/redovery fluid when navigating inside the file (after a short initial pause ~3 seconds) ; NO syntax highlighting; When editing a file larger than 100MB, SlickEdit will turn off Undo/Redo capabilities for all files to improve performance.;
  • 010 Editor ( 13MB kit,evaluation version – 30 days) – memory: 9MB at start, 12-25MB when editing, open in ~4 seconds, save in ~4 seconds, search in 5 seconds, instant edit/undo/redovery fluid when navigating inside the fileNO syntax highlighting;
  • PilotEdit (10MB kit, trial version – 30 days) – memory: 12MB at start, 17-22MB when editing, open in ~32 secondssave in ~1 second, search in 5 seconds, instant edit/undo/redovery fluid when navigating inside the fileSyntax highlighting;
  • vEdit (2MB kit, trial version – 30 days) – memory: 3MB at start, 3MB when editingopen instantlysave in ~2 secondsearch in 2-3 seconds, instant edit/undo/redoconstantly (~2 seconds) waiting for disk operations when navigating inside the fileNO syntax highlighting; weird (old-ish) interface;

Testing conditions:

  • The search was made for some words at the end of the file, with the cursor positioned at the beginning
  • Syntax highlighting was needed for SQL
  • Navigation was tested using the mouse on the scrollbar, not the keyboard]
  • The test file was an SQL export (370MB)
  • I haven’t tried the suggestions on StackExchange – disable temporary file, syntax parsing and undo/redo functionality, though some of the programs offered to do some of these changes automatically for this kind of big files and eventually only for the current session – a thumb up for UltraEdit!

So, my winners are:

  • Free/Open-source: Notepad++, TheGun, Programmer’s File Editor, Cream [gVim], Large Text File Viewer
  • Trial/Evaluation: TextPad, PilotEdit, 010 Editor, vEdit, UltraEdit, SlickEdit
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Posted By: Teodor Muraru
Last Edit: 31 May 2020 @ 09:51 PM

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 22 Jan 2012 @ 5:12 PM 

QR Codes:

A QR code (abbreviated from Quick Response code) is a type of matrix barcode (or two-dimensional code) first designed for the automotive industry. More recently, the system has become popular outside of the industry due to its fast readability and large storage capacity compared to traditional UPC barcodes. The code consists of black modules arranged in a square pattern on a white background. The information encoded can be made up of four standardized kinds (“modes”) of data (numeric, alphanumeric, byte/binary, Kanji), or by supported extensions virtually any kind of data. (source: wikipedia [code for mobile QR code image scanners to the right])

QR codes generators:

URL:

Google Chartshttp://chart.apis.google.com/chart?cht=qr&chs=200×200&chld=l&chl=http%3A%2F%2Fen.qrwp.org%2FQr_code

SPARQCode:

Phone Numbers:

 

 

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Posted By: Teodor Muraru
Last Edit: 09 Feb 2013 @ 12:06 PM

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Categories: Technology, Useful
 06 Dec 2011 @ 1:33 PM 

In my case, this line (pasted as the last line of wp-config.php) worked like a charm:

define('CONCATENATE_SCRIPTS', false );

I found the solution here: Visual Editor does not appear

I hope it helps anyone!

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Posted By: Teodor Muraru
Last Edit: 10 Dec 2011 @ 04:22 PM

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 06 Apr 2011 @ 2:47 PM 
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Posted By: Teodor Muraru
Last Edit: 06 Apr 2013 @ 02:59 PM

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Categories: personal, Technology
 30 Jun 2010 @ 11:15 PM 

SD, SDHC, SDXC, SDHC UHS-I,SDXC UHS-I, (normal-) SD, mini-SD, micro-SD size

credit: SD Videos – SD Association.

SD cards – Usage Tip Videos

See what’s new with SD technology! Find out how to use all SD memory cards and the new UHS-I high speed performance option available for SDXC and SDHC. Learn how to match the new UHS symbols on memory cards to your devices and other usage tips to achieve the best performance.

Watch this video and see how easy it is to use SD Memory Cards in all of the new and exciting SDXC and SDHC devices. To enjoy the optimum experience, simply check your device’s Owners Manual and then match your SD memory card to the device. Since SD is backwards compatible, you can even use your existing cards in new products, too.


Find the Right SD Memory Card

SD miniSD microSD
Full Size
(Up to 2GB)
SD miniSD microSD
High Capacity
(4GB to 32GB)
SDHC miniSDHC microSDHC
Extended Capacity
(Over 32GB up to 2TB)
SDXC microSDXC

SD memory cards come in a variety of speed classes and three different physical sizes: SD, miniSD, and microSD. The SD card is typically used in personal computers, video cameras, digital cameras and other large consumer electronics devices. The microSD and miniSD cards are commonly used in smaller electronic devices like mobile phones. Some manufacturers offer adapters to fit a traditional SD card slot, allowing even greater versatility and flexibility to use the card in a mobile phone as well as a computer or video camera.

To determine the right card for your device, always consult the device’s user manual or contact the manufacturer. All SD memory card formats are readily available in the marketplace and can be found in a range of retail outlets including drug stores, electronics and computer shops and Internet sites.

Choosing the Best Card – What Memory Capacity do I Need?

SD memory cards come in a variety of memory capacities designed to fit your needs and budget. The next-generation SD memory card specification, SDXC, offers the greatest memory capacity and UHS SDHC and SDXC products offer the fastest performance. Your device’s users manual may help you select the memory that is right for your device. You can also determine the best memory capacity based on how you plan to use the card. For cameras, consider the picture resolution of every photo, and for your MP3 player, the bit-rate required for smooth playback. Take a look at our reference chart that illustrates the various storage capacities.

2 GB 4 GB 8 GB 16 GB 32 GB
Movies
(Hi-def movie recording MPEG-4. H.264)
Fine mode (13Mbps/CBR) 20 min. 40 min. 80 min. 160 min. 320 min.
Normal mode (9Mbps/VBR) 30 min. 60 min. 120 min. 240 min. 480 min.
Economy mode (6Mbps/VBR) 45 min. 60 min. 180 min. 360 min. 720 min.
Photos
10 Megapixels, 3648×2736, Fine mode 770 photos 1,540 photos 3,080 photos 6,160 photos 12,320 photos
Music
ACC, MP3 HQ mode, 128Kbps 34 hr. 7 min. 68 hr. 14 min. 136 hr. 27 min. 272 hr. 54 min. 545 hr. 48 min.

* All numbers are approximate. Actual storage will depend on size of data and compression used.

How to Pick the Best Speed

For greatest performance, users should pair their devices with the corresponding SD memory card. Your device user’s manual will help you select the SD memory card performance that will maximize your device performance.


SD Speed Class/UHS Speed Class

Greater Performance Choices

There are two kinds of Speed Class, “Speed Class” and “UHS Speed Class.”

As a characteristic of flash memory, actual transfer speed varies. Variable speeds are difficult to reliably record streaming content such as video because it requires a constant writing speed. Speed Class and UHS Speed Class provide the constant speed necessary for video recording by designating a minimum writing performance so that minimum and constant speed is guaranteed for camcorders, video recorders and other devices with video recording capabilities under the conditional write operation specified in the specification.

Speed Class, designated as Class 2, 4, 6 and 10, is designed for normal and high speed bus interface (mode) and UHS Speed Class 1 is designed for UHS-I bus interface*. (Speed Class and the UHS Speed Class are not compatible.)

*UHS (Ultra High Speed), the fastest performance category available today, defines bus-interface speeds up to 104 Megabytes per second for greater device performance in SDXC and SDHC host products.

Marks Operable Under… Applications SD Memory Card
Speed Class 2 Normal Bus I/F SD video recording SD, miniSD, microSD
SDHC, miniSDHC, microSDHC
SDXC, microSDXC
4 6 HD ~ Full HD video recording
10 High Speed Bus I/F Full HD video recording
HD still consecutive recording
UHS Speed Class 1 UHS-I Bus I/F Full higher potential of recording real-time broadcasts and capturing large-size HD videos SDHC UHS-I and SDXC UHS-I

UHS Speed Class Compatibility

Look for these logos when choosing a SD Card and host device

Speed Class Compatibility

Look for these logos when choosing a SD Card and host device

Fragmentation and Speed

The memory of a card is divided into minimum memory units. The host writes data onto memory units where no data is already stored. As available memory becomes divided into smaller units through normal use, this leads to an increase in non-linear, or fragmented storage. The amount of fragmentation can reduce write speeds, so higher SD card speeds help compensate for fragmentation.

The SD Association has specified operating conditions for SDHC, SDXC, SDHC UHS-I and SDXC UHS-I memory cards to guarantee the minimum speed according to the card’s speed class. Speed logos are provided to help identify cards that comply with these specifications.

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Posted By: Teodor Muraru
Last Edit: 30 Jun 2010 @ 11:31 PM

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 23 May 2010 @ 11:42 AM 

Inside India’s CAPTCHA solving economy

No CAPTCHA can survive a human that’s receiving financial incentives for solving it, and with an army of low-wagedIndia CAPTCHA breakers human CAPTCHA solvers officially in the business of “data processing” while earning a mere $2 for solving a thousand CAPTCHA’s. | August 29, 2008

Gmail, Yahoo and Hotmail’s CAPTCHA broken by| July 3, 2008, 5:46am PDT

Google’s reCAPTCHA flawed | December 15, 2009

Cloned In China

Cloned In China is a tech news website, covering China’s latest consumer electronics, like laptops, Mobile phones, MIDs, portable media players, and so on. We provide the website as an informative resource only. We don’t promote or sell any product  on this website.

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Posted By: Teodor Muraru
Last Edit: 23 May 2010 @ 01:59 PM

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 03 May 2010 @ 12:55 AM 

train-that-never-stops

Instead of stopping, this train picks up and drops off a shuttle from its roof. Pretty slick.

It looks cool and it doesn’t brake for anybody. No, it’s not a teenage rebel, it’s a train. The “Train that Never Stops” looks to save passengers time and train companies money spent on fuel. This concept, which has been kicking around for years, proposes that trains have a special shuttle on their roofs that passengers can enter and exit. At each stop, a new shuttle is picked up and an old one is dropped off, letting passengers (dis)embark via the shuttle without the need for the entire train to stop. It’s an ingenious idea and a fascinating one to watch in action. Check out the concept video below.


“The birth of nanotechnology is popularly taken to be 1989, when IBM Fellow Don Eigler used a scanning tunneling microscope to create the company’s logo out of xenon atoms.”

More »

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Posted By: Teodor Muraru
Last Edit: 27 Oct 2011 @ 02:33 PM

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Categories: Technology
 27 Apr 2010 @ 11:35 PM 

Android 2.2 Froyo (Samsung Galaxy S):

  • Jocuri: Jewellust, Tropical Towers, Camera slide, Chess Genius, Overkill, ParkingBreak, PacMan, Stuck, Droid Breakout, Cube Challenge, SliceIt, Sudoku Free, Memory Trainer, Math Workout, Hangman Classic, Angry Birds, Labyrinth Lite, aTilt 3D Labyrinth, MoleMoleMole!, Bistro Cook, Pacific Wings, Backgammon Free, Zuma’s Revenge, WordUp, World Countries, Capital City Challenge, Fruit Slice, Fallling Ball, Solitaire, Frogger, Vector Ace, Find Differences, GeoQuiz, 250+ Solitaire, Phit Droid, Angry Birds Season, Fling, Geografie, Jumping Jack, …
  • Apps: Most It, My Backup Pro, WeatherBug Elite, Absolute System, WifiTracker, Backup to Gmail, SUFBS, Tasker, Quadrant Advanced, My Reminders, Recordoid, EasyTether Pro, AndroZip Pro, AlarmClock Xtreme, Fancy Widget, Market, SGS Tools, CRKO Commander, Shazam, Record My Call, AppBrain App, Wardrive, AndroidVNC, Quick Settings, iGO, MortPlayer Music (& widgets), SpringPad, GoLauncher, Apps Organizer, Mileage, Apps2sd, Surveyor, Battery Doctor, Barcode Scanner, DiskUsage, ES File Explorer, Instant Heart, JEFIT (& Animation), Droid Streamer, ROM Manager, Relax and Sleep, RunKeeper, QuickDesk, Thinking Space, Layar, WatchDog Lite, 3G Watchdog, Autostart Killer, Anti SMS Bomb, FastReboot, SMS Backup and Restore, Backup everything, App Backup & Reinstall, Call Logs Backup & Reinstall, App List Backup, App List, Google Reader, Ringdroid, Opera Mobile, Shopping Assistant, PBX TV, …
  • Apps websites: http://www.appbrain.com, tested.com, AndroidForums, Android Tapp, lifehacker,

Windows mobile 6.5 Phone (Eten Glofiish X800, HTC Touch HD):

  • Vito Audio Notes Touch (record calls)
  • MemMaid (utility all-in-one)
  • MyMobiler
  • OneNote Mobile
  • TCPMP Player | S2P Player
  • QuickMenu
  • Spb Backup
  • Spb Clone
  • Total Commander CE
  • HomeScreen Plus

Nokia Symbian S60 v3/5 Phone (Nokia E51)

  • X-plore | FExplorer
  • Best CallRecorder
  • BestAlarms | Alarms Pro
  • Contacts Transfer, Rseven
  • MessageStorer ,  SMS & MMS Diary
  • PowerMp3 Player, Fivn Player | PVPlayer
  • planet Radio, yxflash
  • Opera Mobile , Putty
  • Shopping List , Google maps
  • Google Maps

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Posted By: Teodor Muraru
Last Edit: 05 Jan 2013 @ 05:29 PM

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