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rename не переименовывает?$ find . -type f -iname "*.mp3" -exec rename -f -n 's/_//g' {} +
rename(./1/1_1_07.mp3, ./1/1107.mp3)
rename(./1/1_1_13.mp3, ./1/1113.mp3)
rename(./1/1_1_17.mp3, ./1/1117.mp3)
rename(./1/1_1_18.mp3, ./1/1118.mp3)
rename(./1/1_1_19.mp3, ./1/1119.mp3)
rename(./1/1_1_32.mp3, ./1/1132.mp3)
rename(./1/1_1_04.mp3, ./1/1104.mp3)
rename(./1/1_1_24.mp3, ./1/1124.mp3)
rename(./1/1_1_20.mp3, ./1/1120.mp3)
...
$ ls ./0
0_1_01.mp3 0_1_03.mp3 0_1_05.mp3 0_1_07.mp3 0_1_09.mp3 0_1_11.mp3 0_1_13.mp3 0_2_01.mp3 0_2_03.mp3 0_2_05.mp3 0.mp3
0_1_02.mp3 0_1_04.mp3 0_1_06.mp3 0_1_08.mp3 0_1_10.mp3 0_1_12.mp3 0_1_14.mp3 0_2_02.mp3 0_2_04.mp3 0_2_06.mp3
$ rename --version
/usr/bin/rename using File::Rename version 1.10