sync - Linux 如何保持两个文件夹内容一致

Question

Linux 如何保持两个文件夹内容一致 ?

比如

~/dock1 ~/dock2

要保证完全一致 ...

软连接是不行的好像

Answer 1

rsync + inotify

Answer 2

I think you should do automatic backup. If it is my own code files and the like, I usually back them up manually at critical times. It is also simple, just execute cp -r. There is a problem with automatic backup. I don’t know when to back up, for example, I backed up for you in 10 minutes, but actually you want to go back to 1 hour ago, so what should I do, so I still prefer manual backup, after all, it is simple.
In addition, if you just want to compare whether two folders are completely consistent, I wrote a tool

sh#!/usr/bin/env bash
# 比较两个文件夹是否一致
# 计算每个文件文件的md5值，将所有的md5值写入一个文件中，最后再用md5比较这个文件是否一样
# mac系统下计算md5的值命令是md5，如果是linux，请换成md5sum
# 用法：sh is_same.sh dir1 dir2

if [[ $# != 2 ]]; then
    echo "usage: sh is_same.sh <dir1> <dir2>"
    exit 1
fi

# find查找文件，md5计算md5值，awk取出md5值，sort保证次序是一致的，将结果输出到文件中
find  -type f -print | grep -v dir*.md5 | xargs md5 | awk '{print $NF}' | sort > temp.dir1.md5
find  -type f -print | grep -v dir*.md5 | xargs md5 | awk '{print $NF}' | sort > temp.dir2.md5

# 比较两个文件是否相同，如果相同说明两个目录是一致的
md5sum1=$(md5 temp.dir1.md5 | awk '{print $NF}')
md5sum2=$(md5 temp.dir2.md5 | awk '{print $NF}')

if [[ $md5sum1 != $md5sum2 ]]; then
    echo " and  is different"
else
    echo " and  is same"
fi

# 删除临时文件
rm temp.dir1.md5
rm temp.dir2.md5

Answer 3

crontab+rsync

Answer 4

When both folders are local, if one is primary and the other is secondary, you should be able to use inotify + rsync

In addition, you can actually consider bit torrent sync or syncthing. Of course, this is mainly used when they are not on the same machine

Answer 5

Write a synchronization script and put it in crontab

Answer 6

If it is a file, you can use a hard link

Answer 7

Actually, I just want to ask, what is this requirement for...

Answer 8

For Dropbox, I used junction, just for links

Answer 9

rsync is awesome

Answer 10

rsync +1
cron +1