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
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learn(1) General Commands Manual learn(1)
NAME
learn - Provides computer-aided instruction for the C shell
SYNOPSIS
learn [-directory] [subject] [lesson]
The learn command provides computer-aided instruction courses and practice in the use of Tru64 UNIX.
OPTIONS
Allows you to exercise a script in a nonstandard place.
DESCRIPTION
To get started, enter learn; if this is the first time that you are invoking the learn command, you are guided through a series of ques-
tions to determine what type of instruction you want to receive.
If you have used learn before and left your last session without completing a subject, the program uses information in $HOME/.learnrc to
start you up in the same place you left off.
To bypass questions, enter a subject or lesson. In order to enter a lesson, you must know the lesson number that you received in a previ-
ous learn command session. If you do not know the lesson number, enter the lesson number as a subject. The learn command searches for the
first lesson containing the subject you specified. If the lesson is a - (dash), learn prompts for each lesson; this is useful for debug-
ging.
You can specify the following subjects:
files editor vi morefiles macros eqn C
SUBCOMMANDS
There are a few special commands. The bye command terminates a learn session, and the where command tells you of your progress (where m
tells you more.) The again command redisplays the text of the lesson and again lesson lets you review lesson. The hint command prints the
last part of the lesson script used to evaluate a response, while hint m prints the entire lesson script. This is useful for debugging
lessons and might possibly give you an idea about what is expected.
EXAMPLES
To take the online lesson about files, enter: learn files
You are then prompted for further input.
FILES
Playpen directories. Start-up information.
SEE ALSO
Commands: csh(1), ex(1)
learn(1)