Functions to add ID3 tags to mp3 files from their name

tag_music.sh

#!/usr/bin/env bash

tag_tracks ()
{
  reg_name="s/^\([0-9]\{2\}\)___\(.*\)\.\(mp3\|ogg\)/\2/"

  if [ -f ./Folder.jpg ]; then
    img='./Folder.jpg'
  else
    if [ -f ../Folder.jpg ]; then
      img='../Folder.jpg'
    fi
  fi

  for fic in *.{mp3,ogg};
  do
    if [ -f $fic ]; then
      num=`echo $fic | sed "s/\([0-9]\{1,3\}\).*/\1/"`
      name=`echo $fic | sed "$reg_name" | tr -s "_" " "`

      artist=`pwd | egrep -o "([^/]+)/[^/]+(/CD_[0-9]+)?$" | cut -d'/' -f1 | tr -s '_' ' '`
      album=`pwd | egrep -o "[^/]+(/CD_[0-9]+)?$" | cut -d '/' -f1 | tr -s '_' ' '`
      album_num=`pwd | egrep -o "CD_[0-9]+$" | cut -d '_' -f2`
      if [ -z $album_num ]; then
        album_num='1'
      fi
      echo "File: $fic"
      echo "$num   $artist   $album($album_num)   $name"
      
      eyeD3 --remove-all --to-v2.4 -t"$name" -a"$artist" -A"$album" -n$num --add-image=$img:FRONT_COVER --set-text-frame=TPOS:$album_num $fic 1> /dev/null 2> /dev/null
      if [ $? -eq 0 ]; then
        echo "-----"
      else
        echo "KO"
      fi
    fi
  done
}

tag_albums ()
{
  for d in `ls -1 --color=none | tr -s "\n" " "`;
  do
    if [ -d $d ]; then
      cd $d
      line="$d"
      if [ -d ./CD_1 ]; then
        cd CD_1 && tag_tracks 2>&1 && line="$line [OK] "
        cd ../CD_2 && tag_tracks 2>&1 && line="$line[OK]"
        echo $line
        cd ../..
      else
        tag_tracks 2>&1 && line="$line [OK]"
        echo $line
        cd ..
      fi
    fi
  done
}

tag_artists ()
{
  for d in `ls -1 --color=none | tr -s "\n" " "`
  do
    if [ -d $d ]; then
      cd $d
      artist_line="$d"
      tag_albums && artist_line="$artist_line [OK]"
      echo $artist_line
      cd ..
    fi
  done
}

if [[ `basename '$0'` == 'tag_music.sh' ]]; then
  case $1 in
    'tracks')
      tag_tracks
    ;;
    'albums')
      tag_albums
    ;;
    'artists')
      tag_artists
    ;;
    *)
      echo $1
    ;;
  esac
fi