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Top Forums Shell Programming and Scripting Simple script for resize, crop and optimize jpg Post 303025768 by danjde on Monday 12th of November 2018 05:43:44 AM
Old 11-12-2018
WAW! A real lesson in code development!
I would never have thought of such a complete and authoritative answer!
I'm really very grateful! I'll show your answer to some friends I think they'll be amazed!

Regarding what you suggest, it is believed that the utility "file" could be very useful.
Also find the way to not process files already modified by the script.
Unfortunately I do not know if I will succeed in the enterprise, but I try, but give me "some time" to process everything (I'm still under shok! :-))...


Regarding the environment in use you're absolutely right, I forgot to specify it, I'm in a Debian Jessie (Bourne shell), can the script work?
I'll try!


If I can complete it I would like to publish it (not for personal glory, but only to help other people like me who are looking for something like this. You must to know that my search started for a Joomla plugin that had such features, but I did not find it, and I thought it could help GNU Linux!) on GitLab, what do you think about? ;-)


Thanks again!


Davide

------ Post updated at 10:43 AM ------

...relatively "file" utility I read that it would be preferable for safety reasons "identify": h t t p s : / / unix.stackexchange.com/questions/189364/script-to-determine-if-files-are-images

I have to deepen in the coming days..

Thanks again!



Davide
This User Gave Thanks to danjde For This Post:
 

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gitaction(1)						      General Commands Manual						      gitaction(1)

NAME
gitaction - GNU Interactive Tools - per file type action script SYNTAX
gitaction directory file .gitaction directory file DESCRIPTION
gitaction is a script that executes a different action for each file type specified. It is called by the gitfm program when pressing F2 or ^Xa (see the gnuitrc.TERM configuration files in the gnuit manual). The first parameter is the current directory name and the second one is the file name to be matched against the default patterns. The matching is done using the shell 'case' statement. If you press F2 or ^Xa on a *.html file, gitfm will invoke a browser to view it, if you press F2 or ^Xa on a *.tar.gz file, gitfm will list the tar archive contents, if you press the same keys on a *.gz file, gitfm will display its uncompressed contents on the screen, etc ... If you press F2 or ^Xa on a *.gif file or *.jpg file and you have the zgv utility installed, you will be able to see it. If you want to change the gif/jpeg viewer, all you need to do is to change its name in the gitaction script. There are many more file types and viewers that gitaction knows about. In addition, if you are running under GNOME, gnome-open is used, and on MacOS, open(1) is used. see(1) and metamail(1) are also used as fallbacks. If all else fails, the file is displayed using $GNUIT_PAGER. Feel free to change this. If you want to find out what the default action for each file type is (or if you want to modify it), just read/modify the gitaction script. The script can be easily enhanced. Just read it. The .gitaction script is a local version of the gitaction script. When started, gitaction tries to search a script called .gitaction in the current directory and, if it finds it, it starts it. If .gitaction's exit code is 0 ( .gitaction couldn't find a matching pattern), gitac- tion starts its own case statement trying to match the current file name (the second parameter) against its default patterns. The .gitaction script *must* be executable. An example of .gitaction can be found in the directory gitfm is installed into. (usually /usr/local/bin or /usr/bin) Debian users can find it in /usr/share/doc/gnuit/examples/. You should copy the example to the current direc- tory or your home directory and then modify it. BUGS
Please send bug reports to: gnuit-dev@gnu.org SEE ALSO
gitfm(1) gitps(1) gitview(1) gitmount(1) gitkeys(1) gitrgrep(1) gitunpack(1) AUTHORS
Tudor Hulubei <tudor@cs.unh.edu> Andrei Pitis <pink@pub.ro> Ian Beckwith <ianb@erislabs.net> (current maintainer). gitaction(1)
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