Gathering information through Terminal commands

You need an alias. Typing alias sage='open /PATH/TO/Sage.app' will create an alias which will do exactly what you want, run the program just by typing sage. The problem is that this will only last until you close that terminal window (bash). So, you need to create that alias each time you run a new bash. To do so, just:

1. Create or modify a text file called .bash_profile in your home directory.
2. Add alias sage='open /PATH/TO/Sage.app' on it
3. Save the file
4. Load the file once by typing . ~/.bash_profile

Remember that it will be case sensitive, so if you type Sage (instead of sage) it won't work.

Let's start with a small example.

Fire up Automator and create a service with a single "Run Shell Script" step.

Set it to take Folders as input from Finder

Pass input as arguments. Shell is /bin/bash

Bash code:

cd "$@"

for file in *.mov *.flk *.mp4
    do
    ls -1 "$file" >> ~/Desktop/test_file_awk.txt
done

What this does it takes the directory you pass in as "$@" and goes into it then runs the command on all the files in that directory.

"$@" is in quotes to protect against spaces, as is "$file"

So, you can replicate this to your setup:

cd "$@"
i=$(for file in {*.flv,*.mov,*.mp4,*.m4v}
    do 
    /usr/local/bin/mediainfo "--Inform=Video;%Duration%" "$file"
done | awk '{total+=$0}END{print total}')

((i/=1000, sec=i%60, i/=60, min=i%60, hrs=i/60))
timestamp=$(printf "%dh%02dm%02ds" $hrs $min $sec)
echo -e "Total duration of video files in this folder:\n\n$timestamp" > _total_duration.txt

Personally, I would change the output to something like:

> ~/Desktop/"$@"_total_duration.txt

So that the data ends up on your desktop in a file named for the folder, but I have a lot of media directories and I don't want txt files in them.