长文件名字符截短处理

[iwaifor]

有几千条以下格式文件： path1/1 Logosomadonaiaumolam Ha Aziah – Great Solomon Went A Walking-The Australian Opera And Ballt Orchestra+Christopher Lyndon Gee+Linda Thompson+Connell Byrne+Dominic Natoli+John Miley+John Fernon+Raymond Myers+Christopher Doig+Opera Australia Chorus.mp4----path2/1 Logosomadonaiaumolam Ha Aziah – Great Solomon Went A Walking-The Australian Opera And Ballet Orchestra+Christopher Lyndon Gee+Linda Thompson+Connell Byrne+Dominic Natoli+John Miley+John Fernon+Raymond Myers+Christopher Doig+Opera Australia Chorus_-1645431112.mp4

path1/1 Logosomadonaiaumolam Ha Aziah – Great Solomon Went A Walking-The Australian Opera And Ballt Orchestra+Christopher Lyndon Gee+Linda Thompson+Connell Byrne+Dominic Natoli+John Miley+John Fernon+Raymond Myers+Christopher Doig+Opera Australia Chorus.mp4----path2/1 Logosomadonaiaumolam Ha Aziah – Great Solomon Went A Walking-The Australian Opera And Ballet Orchestra+Christopher Lyndon Gee+Linda Thompson+Connell Byrne+Dominic Natoli+John Miley+John Fernon+Raymond Myers+Christopher Doig+Opera Australia Chorus_1488398513.mp4

path1/1 Logosomadonaiaumolam Ha Aziah – Great Solomon Went A Walking-The Australian Opera And Ballt Orchestra+Christopher Lyndon Gee+Linda Thompson+Connell Byrne+Dominic Natoli+John Miley+John Fernon+Raymond Myers+Christopher Doig+Opera Australia Chorus.mp4----path2/1 Logosomadonaiaumolam Ha Aziah – Great Solomon Went A Walking-The Australian Opera And Ballet Orchestra+Christopher Lyndon Gee+Linda Thompson+Connell Byrne+Dominic Natoli+John Miley+John Fernon+Raymond Myers+Christopher Doig+Opera Australia Chorus_1562827457.mp3

path1/Chasin That Neon Rainbow-Alan Jackson Brent Mason Bruce Watkins Dave Pomeroy Denny Henson Eddie Bayers Hargus Pig Robbins Harold Bradley Jimmy Capps Keith Stegall Larry Paxton Paul Franklin Rob Hajacos Roy Huskey Jr. Steve Gibson Weldon Myrick.mp3----path2/Chasin That Neon Rainbow-Alan Jackson Brent Mason Bruce Watkins Dave Pomeroy Denny Henson Eddie Bayers Hargus Pig Robbins Harold Bradley Jimmy Capps Keith Stegall Larry Paxton Paul Franklin Rob Hajacos Roy Huskey Jr. Steve Gibson Weldon Myrick_-1649334346.mp3

由于 linux NAME_MAX 255 限制，对以上文件由 mv path1/filename path2/filename_-.{mp3|MP4}移动时报文件名过长；麻烦各位大大看看，想对 path2/filename_-.{mp3|MP4}文件名截短 20 个字符，希望在‘-*.{mp3|mp4}’之前的部分截短 20 字符（去掉 20 个字符，保持整个文件名在 255 字符限制内），不过有的 path2 文件名末尾是‘{0..9}.{mp3|mp4}’,这个格式不统一。 简化看其实是个重命名操作，无奈系统的文件名字符长度限制。 请问有什么办法没有，感谢