Bash - find matching pairs of files

Question

I have many files in the folder:

Filename1.mp4
Filename2.mp4
Filename3.mp4
Etc.

As well as many files with added suffix to the name:

Filename1_x264.mp4
Filename2_x264.mp4
Filename3_x264.mp4
Etc.

I am trying to catch the matching pairs using find command and execute an external command on them but can't figure out a way to do it yet. Any ideas would be greatly appreciated.

Cyrus · Accepted Answer · 2017-03-04T14:19:20.427

3

With bash and its Parameter Expansion:

for i in *_x264.mp4; do 
  j="${i%*_x264.mp4}.mp4"         # remove suffix _x264.mp4 and add .mp4
  if [[ -e "$j" ]]; then
    echo "$i and $j exists"
  fi
done

edited Mar 04 '17 at 14:19

answered Mar 04 '17 at 14:02

Cyrus

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`-e "$i"` should always be true and can be neglected. – Socowi Mar 04 '17 at 14:17
`-e "$i"` is always true if the pattern matches anything :) Using `shopt -s nullgob` or adding `[[ -e $i ]] || break` as the first line of the loop fixes that small corner case. – chepner Mar 04 '17 at 15:12
@chepner: Thank you. That should be considered. – Cyrus Mar 04 '17 at 18:36
Thank you @Cyrus, chepner and Socowi. It worked like a charm – AndriusWild Apr 07 '17 at 21:52

Bash - find matching pairs of files

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