Linux删除重复文件

Tyan

发布于 2020-03-20 21:12:45

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发布于 2020-03-20 21:12:45

文章被收录于专栏：SnailTyanSnailTyan

文章作者：Tyan 博客：noahsnail.com | CSDN | 简书

1. 引言

在Linux系统处理数据时，经常会遇到删除重复文件的问题。例如，在进行图片分类任务时，希望删除训练数据中的重复图片。在Linux系统中，存在一个fdupes命令可以查找并删除重复文件。

2. Fdupes介绍

Fdupes是Adrian Lopez用C语言编写的Linux实用程序，它能够在给定的目录和子目录集中找到重复文件，Fdupes通过比较文件的MD5签名然后进行字节比较来识别重复文件。其比较顺序为：

大小比较 > 部分MD5签名比较 > 完整MD5签名比较 > 字节比较

3. 安装fdupes

以CentOS系统为例，fdupes的安装命令为：

sudo yum install -y fdupes

4. fdupes的使用

删除重复文件，并且不需要询问用户：

$ fdupes -dN [folder_name]

其中，-d参数表示保留一个文件，并删除其它重复文件，-N与-d一起使用，表示保留第一个重复文件并删除其它重复文件，不需要提示用户。

使用说明：

$ fdupes -h
Usage: fdupes [options] DIRECTORY...

 -r --recurse           for every directory given follow subdirectories
                        encountered within
 -R --recurse:          for each directory given after this option follow
                        subdirectories encountered within (note the ':' at
                        the end of the option, manpage for more details)
 -s --symlinks          follow symlinks
 -H --hardlinks         normally, when two or more files point to the same
                        disk area they are treated as non-duplicates; this
                        option will change this behavior
 -n --noempty           exclude zero-length files from consideration
 -A --nohidden          exclude hidden files from consideration
 -f --omitfirst         omit the first file in each set of matches
 -1 --sameline          list each set of matches on a single line
 -S --size              show size of duplicate files
 -m --summarize         summarize dupe information
 -q --quiet             hide progress indicator
 -d --delete            prompt user for files to preserve and delete all
                        others; important: under particular circumstances,
                        data may be lost when using this option together
                        with -s or --symlinks, or when specifying a
                        particular directory more than once; refer to the
                        fdupes documentation for additional information
 -N --noprompt          together with --delete, preserve the first file in
                        each set of duplicates and delete the rest without
                        prompting the user
 -I --immediate         delete duplicates as they are encountered, without
                        grouping into sets; implies --noprompt
 -p --permissions       don't consider files with different owner/group or
                        permission bits as duplicates
 -o --order=BY          select sort order for output and deleting; by file
                        modification time (BY='time'; default), status
                        change time (BY='ctime'), or filename (BY='name')
 -i --reverse           reverse order while sorting
 -v --version           display fdupes version
 -h --help              display this help message