如何递归这个命令?

如何递归这个命令?

在这里运行 Ubuntu Linux。

我有一个终端命令,可以查找 PWD 中的所有 mp3 文件,使用 mp3info 以分钟为单位获取它们各自的持续时间,对它们求和,并打印 pwd 中所有 mp3 的总持续时间。

for file in *.mp3; do 
  mp3info -p "%S\n" "$file"
done | paste -sd+ | sed 's+\(.*\)+(\1)/60+' | bc

输出示例:

$ for file in *.mp3; do 
  mp3info -p "%S\n" "$file"
done | paste -sd+ | sed 's+\(.*\)+(\1)/60+' | bc
47

所以,PWD 中有 47 分钟的 mp3。

我想将其制作成一个 bash 脚本,该脚本将递归到所有较低的目录,打印它们的名称,并列出每个文件夹中找到的所有 mp3 的总持续时间,例如:

foldernameA 
45 
foldernameB 
89 
foldernameC 
17

ETC。

我尝试过的(“durations.sh”):

#!/bin/bash
find . -type d -execdir sh -c 'for file in *.mp3; 
do 
  mp3info -p "%S\n" "$file"; 
done 
| paste -sd+ | sed 's+\(.*\)+(\1)/60+' | bc

但这只是悲惨地失败了:

$ ./durations.sh
./durations.sh: line 6: syntax error near unexpected token `('
./durations.sh: line 6: `| paste -sd+ | sed 's+\(.*\)+(\1)/60+' | bc'

我显然不知道自己在做什么。

答案1

您可以直接使用 for 循环shopt -s globstar:

环球星

如果设置,文件名扩展上下文中使用的模式“**”将匹配所有文件以及零个或多个目录和子目录。如果模式后跟“/”,则仅目录和子目录匹配。

shopt -s globstar

d=0;
for file in **/*.mp3; do
  d=$((d + $(mp3info -p "%S" "$file")))
done
mins=$(echo "$d / 60" | bc)
secs=$(echo "$d % 60" | bc)

echo "Total $mins minutes and $secs seconds"

答案2

如果你想列出单个文件夹的长度,你需要一个双循环。第一个循环列出目录,第二个循环列出每个目录中的文件:

#!/bin/bash
OIFS="$IFS"
IFS=$'\n'

function secondToTime () { #Convert second to Day, Hours, Minutes, Seconds
    seconds=$1
    min=0
    hour=0
    day=0
    if((seconds>59));then
        ((sec=seconds%60))
        ((seconds=seconds/60))
        if((seconds>59));then
            ((min=seconds%60))
            ((seconds=seconds/60))
            if((seconds>23));then
                ((hour=seconds%24))
                ((day=seconds/24))
            else
                ((hour=seconds))
            fi
        else
            ((min=seconds))
        fi
    else
        ((sec=seconds))
    fi
    echo "$day"d "$hour"h "$min"m "$sec"s
  }

case $1 in #loop though the first argument
  '-h'|'--help')     # Display the help and exit
    echo "Usage: $0 [PATH]"
    echo "Display the total play time of each folder"
    exit 0
    ;;

  !'')      # Will use the argument as target path
    target=$1
    ;;

  *)        # If no argument is specify it will use the current path
    target='.'
    ;;
esac



for folders in `find $1 -type d ` # Find all sub folders in the specifyed path
do
    for folder in $folders # Loop though each folders
    do
      echo Folder $folder:
    folderTime=0;
        for file in `ls $folder/*.mp3 2> /dev/null` #loop though each files in each folders
        do
            fileTime=`mp3info -p "%S\n" "$file"` #get the time lenght of $file
            isNumber=`echo $fileTime | grep -E '^\-?[0-9]+.?[0-9]*$'` #grep only numbers, if it's not a number isNumber will be empty
            if [ "$isNumber" != '' ]  # Check if $isNumber is NOT empty (which mean that it's a number)
            then
              let "folderTime=$fileTime+$folderTime" #Calculate Total duration in seconds
            fi
        done
        secondToTime $folderTime # Convert seconds to days hours minutes seconds and print it out
    done
done
IFS=$OIFS

相关内容