I am using the following command

 mkvmerge -o  newfile.mkv  1.mkv  +2.mkv  +3.mkv   +4.mkv  etc...

this command collates the video files in the list. Usually I have this files in a folder, the number of files can change (not always 4 as in the example). I would like to get a command that:

  1. take the list of mkv files in the given dir
  2. run the command above.

Basically I know how to get the list, eg. FileList=$(ls *mkv)), but then I don't how to get the "+" in front of the file names escluding the first in the list.

Can somebody help with this?

Regards Pierre

for i in *.mkv; do
    if [ -n "$LIST" ]; then LIST="$LIST +"; fi

mkvmerge -o newfile.mkv $LIST

Test if the list is empty; if not, you need to add a space and +. Then run the command with the generated list.

  • 1
    Instead if.. construction you can use bash variable expansion LIST=${LIST:+$LIST' +'}$i
    – Costas
    Feb 6 '15 at 16:00

With bash

shopt -s nullglob
shopt -s extglob
printf "%s\n" "${first_file}" "${add_files[@]/#/+}"
mkvmerge -o newfile.mkv "${first_file}" "${add_files[@]/#/+}"

This method does not use a loop.
Also, to allow for embedded non-printable characters (eg. space), ls -Q quotes the filename

eval "$(ls -Q1 *.mkv | sed '1s/^/mkvmerge -o newfile.mkv /; 1!s/^/ +/' | tr -d '\n')"

Note that tr acts at the byte level, and as such will delete \x0D (newline char) embedded within non-ascii filename chars.

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