问一个 shell 里的问题, 字符串消失了一个点? - V2EX
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happywowwow
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问一个 shell 里的问题, 字符串消失了一个点?

  •  
  •   happywowwow 2018-04-19 10:40:29 +08:00 1763 次点击
    这是一个创建于 2739 天前的主题,其中的信息可能已经有所发展或是发生改变。

    想把 .flac 转成 .wav

    #!/usr/bin/env bash set -e find . -iname "*.flac" | while read f do target=${f//flac/wav} echo ${f} echo ${target} done echo "###############################" find . -iname "*.flac" | while read f do target=${f//flac/wav} echo ${f} echo ${target} ffmpeg -y -i "${f}" "${target}" done 

    输出:

    ./Remember Me (Lullaby) - Gael Garcia Bernal,Gabriella Flores,Libertad Garcia Fonzi.flac ./Remember Me (Lullaby) - Gael Garcia Bernal,Gabriella Flores,Libertad Garcia Fonzi.wav ./Rewrite The Stars - Zac Efron,Zendaya.flac ./Rewrite The Stars - Zac Efron,Zendaya.wav ############################### ./Remember Me (Lullaby) - Gael Garcia Bernal,Gabriella Flores,Libertad Garcia Fonzi.flac ./Remember Me (Lullaby) - Gael Garcia Bernal,Gabriella Flores,Libertad Garcia Fonzi.wav ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers ...... ...... /Rewrite The Stars - Zac Efron,Zendaya.flac /Rewrite The Stars - Zac Efron,Zendaya.wav ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers ...... ...... /Rewrite The Stars - Zac Efron,Zendaya.flac: No such file or directory 

    可以看到, 第二个循环里, 处理第二首歌, 那个 . 消失了?...

    如果我设置了 set -ex 可以看到是这样的

    第一个循环 ...省略 + read f + target='./Rewrite The Stars - Zac Efron,Zendaya.wav' + echo ./Rewrite The Stars - Zac Efron,Zendaya.flac ./Rewrite The Stars - Zac Efron,Zendaya.flac + echo ./Rewrite The Stars - Zac Efron,Zendaya.wav ./Rewrite The Stars - Zac Efron,Zendaya.wav ...省略 第二个循环里 ...省略 + read f + target='/Rewrite The Stars - Zac Efron,Zendaya.wav' + echo /Rewrite The Stars - Zac Efron,Zendaya.flac /Rewrite The Stars - Zac Efron,Zendaya.flac + echo /Rewrite The Stars - Zac Efron,Zendaya.wav /Rewrite The Stars - Zac Efron,Zendaya.wav + ffmpeg -y -i '/Rewrite The Stars - Zac Efron,Zendaya.flac' '/Rewrite The Stars - Zac Efron,Zendaya.wav' ...省略 

    都是一样的循环啊...

    两首歌名

    Remember Me (Lullaby) - Gael Garcia Bernal,Gabriella Flores,Libertad Garcia Fonzi.flac Rewrite The Stars - Zac Efron,Zendaya.flac 
    5 条回复    2018-04-19 14:23:13 +08:00
    goofool
        1
    goofool  
       2018-04-19 10:55:01 +08:00
    什么点
    jasonyang9
        2
    jasonyang9  
       2018-04-19 11:02:07 +08:00
    @goofool #1 路径最前面那个表示当前工作目录的点

    我这边试了木有问题的,奇怪了
    happywowwow
        3
    happywowwow  
    OP
       2018-04-19 11:02:49 +08:00
    @goofool
    @jasonyang9

    ./Rewrite The Stars - Zac Efron,Zendaya.flac 变成了
    /Rewrite The Stars - Zac Efron,Zendaya.flac
    happywowwow
        4
    happywowwow  
    OP
       2018-04-19 13:40:31 +08:00
    @jasonyang9 也有尝试了, 浮现了. 可能得就是这两个歌名, 因为我之前处理的文件夹里有很多歌曲, 发现总是这里两首的时候过不去.
    happywowwow
        5
    happywowwow  
    OP
       2018-04-19 14:23:13 +08:00   1
    @goofool
    @jasonyang9
    搞定. 怀疑是 ffmpeg 用到了 stdin 吃了几个字符把.

    ```
    #!/usr/bin/env bash
    set -e

    for f in *flac; do
    target=${f//flac/wav}
    echo ${f}
    echo ${target}
    ffmpeg -y -stats -i "${f}" "${target}"
    done
    ```
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