2014-08-31 11:55

Mathilde’s contribution:

This script allows you to launch a search by filesize on opensubtitles.org, with a simple right-click on a video file.

If it does not exist, create the .local/share/nautilus/scripts directory in your personnal folder (from Nautilus, you can use the Ctrl+H shortcut to display hidden files and be able to see the .local directory).

Save the subtitle file in .local/share/nautilus/scripts

Add execution permission to the script, in file properties, or running the command chmod +x ~/.local/share/nautilus/scripts/subtitle

Open Nautilus (aka “Files”). Select the film you want to search subtitles for, right-click > scripts > subtitle.
A browser window will open directly on opensubtitles.org with your search results.

By default, the script will search subtitles in english. To change the language, open the script and change the LANG variable.

Content of subtitle script:



SIZE=$(stat -c %s $FILE)

xdg-open "http://www.opensubtitles.org/eng/search/sublanguageid-$LANG/moviebytesize-$SIZE"
2014-08-31 11:55 · Tags: ,
2012-04-16 14:00

After searching a long time on the Net, here is how to use ImageMagick to compare two images (diff), to determine if the images are similar, or if one image is a resize version of the other.

convert image1 image2 -resize '400x300!' MIFF:- | compare -metric AE -fuzz '10%' - null:

The convert command takes 2 images and scale them to a smaller identical size. We then pipe them to the compare command. The compare command will count the number of different pixels.

The command displays the number of different pixels. If it’s zero then pictures are similar.

2 parameters can increase the similarity tolerance:

  • The size of thumbnails to compare: the smaller it is, the more details are removed. You can use 1/4 of the smaller image for example.
  • The -fuzz parameter: the color distance tolerance. The more you increase this param, the more you allow different colors. Color difference is almost undetectable below 2%.


  • It’s better to keep ratio while generating thumbnails.
  • The exclamation mark is needed to force image scale without preserving ratio. Otherwise in some cases the 2 thumbs are not strictly the same size and the compare command fails.

I also made a small script to scale at 1/4 of the small image and displays the percentage of different pixels: imdiff

./imdiff /tmp/bad.jpg ../Public/images/bad.jpg
pixel difference: 2.927%


2012-04-16 14:00 · Tags: , ,
2011-11-13 21:32

Here is the little sh script I made to do that. The LOAD DATA INFILE command exists but is not capable of creating the table structure.




[ "$CSV" = "" -o "$TABLE" = "" ] && echo "Syntax: $0 csvfile tablename" && exit 1

FIELDS=$(head -1 "$CSV" | sed -e 's/'$DELIM'/` varchar(255),\n`/g' -e 's/\r//g')
FIELDS='`'"$FIELDS"'` varchar(255)'

#echo "$FIELDS" && exit

mysql $MYSQL_ARGS $DB -e "



(See comment: “Posted by John Swapceinski on September 5 2011 5:33am”)

2011-11-13 21:32 · Tags: , ,
2010-10-22 00:29

Finding a good solution for sharing files between Linux users is a nightmare.

If using a unique UID is not a problem, it’s the most simple solution. All clients access files with the same UID. This way you cannot know who does what, and users cannot fine tune access rights.

The problem: default umask is ALWAYS 0022, so that any created file will get rw– r–– r–– permissions. Only the owner can write. Nobody else. To share files, a group must have write access.

You can change the umask. For command line, you set it in .bashrc or .profile, or /etc/profile for all users. For a SFTP share, you can set it with a trick. For Apache HTTP server, you can set it with /etc/apache2/envvars under Debian.

If file sharing is only done via on service, changing umask is simple, otherwise it’s not that easy. And even if you change umask for all services, nothing is perfect: for example it doesn’t work with Nautilus and SFTP. Some clients drop files and issue a chmod right after: the hell. You can also try the power of POSIX ACL to force permissions. But problems still remain with some clients.

And for the umask, maybe you don’t want all files to be dropped group writable. Maybe you want more granularity on permissions.

So I abandonned the idea of fixing the problem at the source in favor of some trick AFTER file creation.
The most simple solution is the cron task: every X minutes, run chmod -R g+w on the directory. This way permissions are not fixed immediately, but asynchronously. And it adds a (very) little more load to your system.

My solution uses inotify to listen for file changes and force permissions when files are created:

aptitude install inotify-tools

And the magical command:

inotifywait -mrq -e CREATE --format %w%f /tmp/mytest/ | while read FILE; do chmod g=u "$FILE"; done

UPDATE 2010-10-30
To support spaces at the end of filenames, and backslashes, use:

inotifywait -mrq -e CREATE --format %w%f /tmp/mytest/ | while IFS= read -r FILE; do chmod g=u "$FILE"; done

Thanks to vitoreiji (see comments)

inotifywait listens for events in the /tmp/mytest directory. When a file is created, it’s displayed on standard output. Then each fileline is read by the while loop and permissions are changed. g=u gives the group the user’s permissions (with g+w, if the user drops a file with rw– ––– –––, permissions will be rw– –w– –––).

You can now test file/directory creation and copy. mkdir -p a/b/c/d/e shoud also work.

Finally, add it in a boot script:

vi /usr/local/bin/inotifywait.sh && chmod +x /usr/local/bin/inotifywait.sh
# Take the directory name as argument

inotifywait -mrq -e CREATE --format %w%f "$1" | while read FILE
	chmod g=u "$FILE"
vi /etc/init.d/inotifywait.sh && chmod +x /etc/init.d/inotifywait.sh
#! /bin/sh

case "$1" in

	rm -f /tmp/inotifywait.log
	/usr/local/bin/inotifywait.sh /path/to/dir/ >/tmp/inotifywait.log 2>&1 &
	echo "Error: argument '$1' not supported" >&2
	exit 3
	# killall inotifywait ???
	echo "Usage: inotifywait.sh [start|stop]" >&2
	exit 3


(Debian way)

update-rc.d inotifywait.sh defaults

Note: a drawback: there is a limit on the number of tracked files. See -r option in man inotifywait.

Then the final touch in order for the new files to be created with the same group as their parent: setgid bit for all directories.

find /path/to/dir -type d -exec chmod g+s {} \;


2010-10-22 00:29 · Tags: , , , ,
2009-12-10 21:09


I want to create a server-www alias that connects me to the SSH server and change the directory to /var/www/ right after the connection.

There it is :

ssh -t server 'cd /var/www && $SHELL'

And for the alias, add this in your ~/.bashrc:

alias server-www="ssh -t server 'cd /var/www && $SHELL'"
server-www # test it !

References :

2009-12-10 21:09 · Tags: ,
2009-08-20 12:21

To know the IP address you use to go out on the Internet, you can use a site like http://www.whatismyip.com

In text mode with no Web browser, it’s a bit more complicated. You can use the following command:

wget --user-agent="Mozilla/5.0" -O - http://www.whatismyip.com 2>/dev/null | grep -o "Your IP Address Is: [0-9.]*"

We have to simulate a real browser, or the site refuses us.

UPDATE 14/01/2010

To find your external IP address, an even more elegant way:

dig +short myip.opendns.com @resolver1.opendns.com

UPDATE 06/05/2010

The best way:

curl icanhazip.com


2009-08-20 12:21 · Tags: ,