I have a big list of files with names (videos)

I managed to write all file names in a text file. Now I have a text file with a lot of file names (one episode per line) Now I need something that can read that text file and tell me what episode E number is missing

S1-E18-(Date)-(Title)-(Random numbers).mp4

Here is an example of a list


In this case its easy to see that the files S1-E2 and S10-E4 are missing. but if I have a big list then how can I find the missing files. (Leave Season number S1, S2) just need to check E means episode number

The largest existing file's number is S50-E2184 and The Smallest existing file's number is S1-E1

  • 1
    What have you tried? – Eric F Nov 27 at 14:03
  • Your example is not very good. – harrymc Nov 27 at 14:54
  • Is the number of episodes for each season fixed? or at least known? – glenn jackman Nov 27 at 16:15
  • @EricF I tried Nothing – Eli Shain Nov 28 at 13:04
  • 2
    Your English is good enough. I understand that S10-E4 is missing, but what about S10-E1 to E3 and E5 to whatever and we not know the last number. You do not give enough information to understand the full problem. – harrymc Nov 28 at 13:44

Save all the names in a file with name "file_with_list_of_files" and run below command in a linux/unix terminal[I tried it in mac terminal]:

cat file_with_list_of_files | sed 's/^[A-Z][0-9]*-//g' | grep -v "^E"

-- or --

cat file_with_list_of_files | awk -F- '{print $2}' | grep -v "^E"

This lists all file name does not have a E after first - (hyphen). You may find other better ways to do it as well.

  1. Prepare a file with all episode signatures. You didn't tell us how many episodes there are in each season but you obviously need to know. This is how you prepare the file:

    >all_episodes   # just to empty the file which may or may not exist
    printf 'S1-E%s\n'  {1..3}    >>all_episodes   # 3 episodes in season 1
    printf 'S2-E%s\n'  {1..5}    >>all_episodes   # 5 episodes in season 2
    printf 'S3-E%s\n'  {1..8}    >>all_episodes
    # and so on
    printf 'S50-E%s\n' {1..2184} >>all_episodes

    This assumes each season starts with its own episode number one (your question is not clear about it). The file consist of lines in a form S<n>-E<m>, e.g S2-E3.

  2. Create a file of owned episodes in the same form:

    cut -d - -f -2 your_current_list >owned_episodes

    The command takes - as a delimiter and returns line fragments up to the field number 2 from your current list.

  3. Treat owned_episodes as patterns and filter all_episodes to find lines without any pattern:

    grep -vxFf owned_episodes all_episodes

    Note we use -x here; the point is S50-E3 shouldn't match S50-E31. -F is not necessary in your case but in general one should use it while supplying fixed strings. The options are:

    Match using fixed strings. Treat each pattern specified as a string instead of a regular expression. [...]

    -f pattern_file
    Read one or more patterns from the file named by the pathname pattern_file. [...]

    Select lines not matching any of the specified patterns. [...]

    Consider only input lines that use all characters in the line excluding the terminating <newline> to match an entire fixed string or regular expression to be matching lines.

Your Answer

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Not the answer you're looking for? Browse other questions tagged or ask your own question.