Concatenate .flv videos. Tested on ffmpeg version 3.2.
$ catflv *.flv
Now you have a final.flv in that folder.
Just copy catflv.sh in your PATH and make sure it is executable.
Example:
$ sudo chmod +x catflv.sh
$ sudo cp catflv.sh /usr/local/bin/catflv
In the above example, you must have /usr/local/bin in your PATH. To check that run:
$ echo $PATH
My Result:
/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games
Each path is seperated by :.