Commands tagged jpg sorted by votes

Commands tagged jpg (12)

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Rename all .jpeg and .JPG files to have .jpg extension

the "i" controls case sensitiveness. It's slightly inefficient since it uselessly renames .jpg to .jpg, but that's more than compensated by launching only one process instead of two, besides being shorter to write.
This is sample output - yours may be different.
16

rename 's/\.jpe?g$/.jpg/i' *

icebrain · 2010-11-14 21:22:13 1
for all flv files in a dir, grab the first frame and make a jpg.

This is handy for making screenshots of all your videos for referring to in your flv player.
This is sample output - yours may be different.
12

for f in *.flv; do ffmpeg -y -i "$f" -f image2 -ss 10 -vframes 1 -an "${f%.flv}.jpg"; done

topher1kenobe · 2009-05-18 22:34:59 1
Find jpeg images and copy them to a central location

Use if you have pictures all over the place and you want to copy them to a central location Synopsis: Find jpg files translate all file names to lowercase backup existing, don't overwrite, preserve mode ownership and timestamps copy to a central location
This is sample output - yours may be different.
4

find . -iname "*.jpg" -print0 | tr '[A-Z]' '[a-z]' | xargs -0 cp --backup=numbered -dp -u --target-directory {location} &

oracular · 2009-12-10 08:47:04 0
Extracts PDF pages as images
This is sample output - yours may be different.
1

convert in.pdf out.jpg

ivanatora · 2010-02-26 10:51:33 0
Rename all .jpeg and .JPG files to .jpg
This is sample output - yours may be different.
1

rename 's/\.jpeg/\.jpg/' *.jpeg; rename 's/\.JPG/\.jpg/' *.JPG

unixmonkey14095 · 2010-11-14 11:47:04 1
Regnerate Exif thumbnail.

Regnerate Exif thumbnail.
This is sample output - yours may be different.
1

jhead -rgt file-name.jpg

fabio · 2014-05-09 08:36:12 0
sync a directory of corrupted jpeg with a source directory

Find all corrupted jpeg in the current directory, find a file with the same name in a source directory hierarchy and copy it over the corrupted jpeg file. Convenient to run on a large bunch of jpeg files copied from an unsure medium. Needs the jpeginfo tool, found in the jpeginfo package (on debian at least).
This is sample output - yours may be different.
0

for i in *jpg; do jpeginfo -c $i | grep -E "WARNING|ERROR" | cut -d " " -f 1 | xargs -I '{}' find /mnt/sourcerep -name {} -type f -print0 | xargs -0 -I '{}' cp -f {} ./ ; done

vincentp · 2009-05-07 00:30:36 0
Converts all jpg files to 75 quality.

Requires ImageMagick to be installed. This command was stolen from @climagic on Twitter. Probably a duplicate of command below, but this command uses slightly higher quality. http://www.commandlinefu.com/commands/view/707/compress-images-using-convert-imagemagick-in-a-bulk
This is sample output - yours may be different.
0

find . -type f -name '*.jpg' -exec convert -quality 75 {} {} \;

bobby_tables · 2011-09-23 13:51:18 0
converts an A4 PDF file to accurate jpgs
This is sample output - yours may be different.
0

pdf2jpg(){ convert -density 400 -bordercolor white -border 0 -resize 992x1403 -quality 85 $1 ${1/%pdf/jpg} ; }

return13 · 2012-11-08 15:28:18 1
List image attributes from a folder of JPEG images

Runs the identify command (from ImageMagick) on each jpg file in the current directory and returns image details according to the format parameter. The example here returns: Filename FileSize Compression Width Height More information about the available format options can be found here: http://www.imagemagick.org/script/escape.php I usually redirect the output to a text file using "> listofdetails.txt" at the end. Spreadsheet magic can then be applied. Show Sample Output
This is sample output - yours may be different.
```
402670154.jpg 20095B 80 600 400
402670164.jpg 47173B 80 600 600
402670174.jpg 88055B 95 800 800
402680421.jpg 45769B 80 586 388
402680424.jpg 45769B 80 586 388
402680442.jpg 160137B 99 600 600
```
0

for file in *.jpg; do identify -format '%f %b %Q %w %h' $file; done

phattmatt · 2012-11-16 10:06:35 1
Convert Canon CR2 raw pictures to JPG

This command takes all CR2 files in the current directory and convert them into JPG
This is sample output - yours may be different.
0

for i in *.CR2; do dcraw -c -a -h $i | ppmtojpeg > `basename $i CR2`JPG; echo $i done; done

optyler · 2013-07-25 14:58:15 0
Split an image in half for use on dual screens (mostly for use under KDE which treats each screen separately)

Output should be two JPG files named like "output-1.jpg" and "output-2.jpg". The convert command is part of ImageMagick so you'll need that and dependent packages installed to use it.
This is sample output - yours may be different.
0

convert yourdoublewideimage.jpg -crop 50%x100% +repage output.jpg

pagesix1536 · 2014-01-15 15:34:41 0

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List files size sorted and print total size in a human readable format without sort, awk and other commands.

Faster find and move using the find and xargs commands. Almost as fast as locate.

Only tested on Linux Ubunty Hardy. Works when file names have spaces. The "-maxdepth 2" limits the find search to the current directory and the next one deeper in this example. This was faster on my system because find was searching every directory before the current directory without the -maxdepth option. Almost as fast as locate when used as above. Must use double quotes around pattern to handle spaces in file names. -print0 is used in combination with xargs -0. Those are zeros not "O"s. For xargs, -I is used to replace the following "{}" with the incoming file-list items from find. Echo just prints to the command line what is happening with mv. mv needs "{}" again so it knows what you are moving from. Then end with the move destination. Some other versions may only require one "{}" in the move command and not after the -I, however this is what worked for me on Ubuntu 8.04. Some like to use -type f in the find command to limit the type.

Search apache virtual host by pattern

Outputs contents of virtual hosts containing PATTERN. Particularly useful for pefrorming complex searches. E.g. search for docroot of www.example.com: $ sed -n '/^[^#]*

Benchmark SQL Query

Benchmark a SQL query against MySQL Server. The example runs the query 10 times, and you get the average runtime in the output. To ensure that the query does not get cached, use `RESET QUERY CACHE;` on top in the query file.

Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

Read choice from user instantaneously

Usage exaple cmd $echo 'Sure to continue ??'; read -n1 choi; if [ "$choi" = 'y' ] || [ "$choi" = 'Y' ]; then echo -e '\nExecuting..'; else echo 'Aborted'; fi

Get a file from SharePoint with cURL

If you know the URL of a file on a SharePoint server, it's just a matter of logging in with your AD credentials to get the file with cURL

Matrix Style

I like the fact the Patola's version uses only ones and zeros, but I also like the sparse output of the other versions. This one combines both of those features and eliminates some unnecessary cruft. You can vary the sparseness by changing "$(($RANDOM % 5))" to another number. The number in this term "$(($RANDOM % 4))" controls how frequently the numbers are output bold.

Format partition with ext4 but without a journal

For slow flash memory (cheap thumb drive), ext4 is the fastest stable file system for all use cases with no relevant exception: http://www.linuxplanet.com/linuxplanet/tutorials/7208/1 Since we can usually dispense with the benefits of a journal for this type of storage, this is a way to achieve the least awful I/O-speed. Disabling the journal for an existing ext4 partition can be achieved using $ tune2fs -O ^has_journal /dev/sdXN Note that it is often recommended to format removable flash media with ext2, due to the lack of a journal. ext4 has many advantages over ext2 even without the journal, with much better speed as one of the consequences. So the only usecase for ext2 would be compatibility with very old software.

Look for English words in /dev/urandom

Little faster alternative.

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Commands tagged jpg (12)

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