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Full Discussion: Function to get the duration of all videos in a folder(s)
Top Forums Shell Programming and Scripting Function to get the duration of all videos in a folder(s) Post 303016240 by RudiC on Monday 23rd of April 2018 05:39:16 AM
Old 04-23-2018
That is a variation of bash's "here documents": "here strings". This contruct evaluates the expression after the <<< and presents the result on stdin of the (here: read) command.
I don't know about exiftool nor do I have access to it, so simulated it with a cat of several files with integer numbers, trying to condense most of your script into the following three lines:
Code:
shopt -s extglob
IFS=: read DAYS HRS MIN SEC <<< $(printf "%(%j:%T)T" $(( $(cat *.@(avi|mp4|mkv) | tr '\n' '+' ) 0 )) )
echo $(( --DAYS)) $((--HRS)) $MIN $SEC
0 00 23 30

Here you have
- a here string to read the time elements from the result of printf
- a printf converting seconds to Day, Hour, Minute, and Second (using the "epoch" seconds; day and hour will start at 1 so have to be decremented for later use)
- an "extended pattern matching" for the video files in the working directory (use exiftool in lieu of cat for your purposes)
- shell "Arithmetic Expansion" $(( ... ))

The use of the extended pattern matching may be limited by sheer file count resp. file names' lengths, should they exceed the ARG_MAX or LINE_MAX system parameters...
Last edited by RudiC; 04-23-2018 at 07:33 AM..
This User Gave Thanks to RudiC For This Post:
zouhair
 

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LEARN ABOUT OSF1

rmf

rmf(1)							      General Commands Manual							    rmf(1)

NAME

       rmf - remove folder (only available within the message handling system, mh)

SYNOPSIS

       rmf [+folder] [-help] [-[no]interactive]

OPTIONS

       Prints  a  list of the valid options to this command.  Asks for confirmation before deleting a folder. By default, rmf deletes a folder and
       its messages without asking for confirmation.  If you specify the -interactive option, rmf asks if you are sure before deleting the folder.
       You are advised to use this option, since when rmf deletes a folder its contents are lost irretrievably.

DESCRIPTION

       The  rmf  command  removes all of the messages within the current folder, and then removes the folder itself. If there are any files within
       the folder which are not part of MH, they are not removed, and an error message is displayed.

       You can specify a folder other than the current folder by using the +folder argument. If you do not specify a folder, and rmf  cannot  find
       the current folder,rmf asks you whether you want to delete +inbox instead.

       If the current folder is removed, it makes +inbox current.

       Note that the rmf command irreversibly deletes messages that do not have other links, so use it with caution.

       If  the	folder	being removed is a sub-folder, the parent folder becomes the new current folder, and rmf tells you that this has happened.
       This provides an easy mechanism for selecting a set of messages, operating on the list, then removing the list and returning to the current
       folder from which the list was extracted.

       Using  rmf  to  delete a read-only folder deletes the private sequence and current message information from the file, without affecting the
       folder itself. If you have sub-folders within a folder, you must delete all the sub-folders before you can delete the folder itself.

PROFILE COMPONENTS

       Path: To determine the user's Mail directory

EXAMPLES

       This example shows how rmf asks for confirmation when the -interactive option is used: % rmf -interactive +test Remove folder "test"? y

FILES

       The user profile.

SEE ALSO

       rmm(1)

																	    rmf(1)
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