Linux：删除重复文件工具fdupes

我写的去除重复文件的类（Java编写，跨平台）

https://github.com/xuejianbest/tools/blob/master/src/com/lwt/tools/FileUtil.java

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另外介绍个Linux开源工具：fdupes
https://github.com/adrianlopezroche/fdupes

安装

Ubuntu

sudo apt install fdupes

CentOS

centos 6：
https://centos.pkgs.org/6/epel-x86_64/fdupes-1.6.1-1.el6.x86_64.rpm.html

centos 7：
https://centos.pkgs.org/7/epel-x86_64/fdupes-1.6.1-1.el7.x86_64.rpm.html

从以上网址下载rpm包，用以下命令安装：

rpm -ivh fdupes*.rpm

使用

列出目录列表中目录（不包括子目录）包含的重复文件：

fdupes dir1 dir2

同上，-r参数表明包含dir2子目录中的文件（子目录和祖先目录中文件相同也算重复）：

fdupes dir1 -r dir2

-d参数，删除重复文件，具体保留哪个会让用户选择：

fdupes -rd dir

-N参数，删除重复文件并自动保留第一个，不让用户选择：

fdupes -rdN dir

帮助

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, linking and deleting; by
                  	mtime (BY='time'; default) or filename (BY='name')
 -i --reverse     	reverse order while sorting
 -v --version     	display fdupes version
 -h --help        	display this help message