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Functions

Create a symbolic link tree that shadows a directory structure

Terminal - Create a symbolic link tree that shadows a directory structure
find /home/user/doc/ -type d -printf "mkdir -vp '/home/user/Dropbox%p'\n" -o -type f -printf "ln -vs '%p' '/home/user/Dropbox%p'\n" | sh
2009-03-29 09:25:12
User: jnash
Functions: find
0
Create a symbolic link tree that shadows a directory structure

Extremely useful to maintain backups if you're using Dropbox. This mirrors the entire directory structure and places symlinks in each to the original file. Instead of copying over the data again to the ~/Dropbox folder creating a symbolic link tree is much more sensible in terms of space usage.

This has to be supplemented by another script that removes dead symlinks in the Dropbox folder which point to files that have been moved/removed.

find -L ./ -type l -delete

And then removing empty directories

find ./ -type d -exec rmdir 2>/dev/null {} \;

**Actually after some finding I found lndir which creates symbolic trees but it wasn't in the Arch repos so.. ;)

Alternatives

There are 3 alternatives - vote for the best!

Terminal - Alternatives

Know a better way?

If you can do better, submit your command here.

What others think

Holy crap, that's compicated.

If the src and dest are on the same filesystem (and you're on a *nix box), you may as well use hard links. Your command is reduced to:

cp -al src dest

Rather than dangling symlinks, which can also be found using the "symlinks" command, you will end up with files with a hard-link count of 1.

find src -type f -links 1 -delete

Finally you can tidy the empty directory command:

find . -depth -type d ! -name . -exec rmdir --ignore-fail-on-non-empty {} \;

This version will remove deep, but empty trees, and it won't complain about non-empty dirs.

Comment by flatcap 382 weeks and 4 days ago

Er, .. well I'll take that as a compliment :)

But, in all truthfullness, I think it is simple. find just branches into two (if/else) for dirs and files and either makes a directory or makes a symlink to the file.

Relatively, however, I guess yours wins in terms of complexity. But hard links might be a tad little more unsafe IMO considering I'm backing up stuff..

Comment by jnash 382 weeks and 4 days ago

If you're trying to back up data, this is very much the wrong way to do it.

Symlinks are NOT a backup. All they do is point to a file. If that file is changed, the symlink reflects that. Try this:

echo foo>file;ln -s file symlink;cat file;echo whoops>file;cat symlink

This creates a file, symlinks it, edits the file, and changed your "backup".

Hard links aren't safe either. do the same thing, only, you have to look harder to find out it's a link.

echo foo>file;ln file hardlink;cat file;echo whoops>file;cat hardlink

The only way to back up the data is to actually copy it elsewhere.

If you want to back up and save space, then rsync is your friend. It has some parameters that will compare to previous backups, and copy any changed files since the last backup, and hard link the rest. This way, you can delete any backup you want, and all others are unaffected. I can't tell you what they are, but google will help out:

http://www.google.com/search?q=rsync+incremental+backup

You may also be interested in Flyback, http://flyback-project.org/ , which is a gui wrapper over rsync.

Good luck!

Comment by clockworkavian 382 weeks and 4 days ago

OP mentioned "dropbox", I think that copies the stuff to the server.

I am interested in expanding this idea to re-point the symlinks to other locations if the information has moved. it won't be foolproof but something that "finds" and repoints the link. Only ways I can think of doing this involve long scripts, so oneliners would be apprecaited if anyone can think of one.

Comment by unixmonkey3054 382 weeks and 4 days ago

@clockworkavian I think this is useful in the dropbox scenario, maybe you have a folder full of massive files and it doesn't make sense for you to keep it within your dropbox folder, by symlinking you are not using up local HDD space but it will still get uploaded to dropbox. I've done this by just symlinking the root folder. I'm interested in this mirroring approach however as there are certain files in my source folder that are massive and would fill up my dropbox however I am wanting to backup the smaller files in there so I am currently attempting to modify this script to accept a filetype filter.

Comment by stubar 78 weeks ago

2016-6-7 leilei

"Tweed is an excellent fabric especially when you are living in place like London. London is known for its cold weather and in such climate, tweed works absolutely fine. One of the biggest advantages of buying a tweed suit is that you it can be worn all together or can be incorporated separately into pieces in your wardrobe. Tweed suits in London is quite famous amongst men. So let us understand, what exactly tweed fabric is.

What is Tweed?

Tweed is a warm rough to touch fabric and was originated in Scotland. The reason why tweed suits in London are famous is because of its loose weave which makes it flexible and comfortable during winters. The tweed fabric is referred to the weave of fabric; therefore when you see different kinds of tweed, it would tell you the pattern it has been woven. One of the most popular kinds of tweed is the herringbone tweed which a diagonally v-shaped black and white weave. The herringbone tweed gives a rich visual texture and known for its versatility.

Ways to wear Tweed in winters

Everybody needs to wear warm clothes during the winter month to protect from the chilly weather outside. However, many people think that they might have to compromise fashion during those chilly months. Not now! There are many fabrics that you can use to protect yourself from the weather as well as still enjoy great looks. Tweed is one of the fabrics that can make you awesome even in winters as well. Below are some ways of how you can incorporate tweed with other pieces in your wardrobe

"

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"Casually ? if you are a starter with tweed then it is recommended to start with plain variety of tweed. You can wear a tweed jacket with dark blue jeans and high boots. Incorporate a neutral t-shirt or a winter shirt under the jacket.

At work ? Tweed suit in London are quite popular as one of the formal attires. Heavy woven tweeds can make you look older, so try buying tweed suits in London that are finely weaved and pair it with your regular shirts like white or blue with smart formal shoes. Believe it or not, it can win you praise at work.

Accessorise ? Apart from wearing tweed suits in London as attire you can even use accessories made out of tweed. Tweed caps, laptop bags, scarves, gloves are a smart way to incorporate tweed in your winter collection. It is also a safe way of using tweed fabric if you are not too comfortable wearing it. There is even footwear that has tweed as their centre fabric and looks awesome.

Taking care of Tweed

Though the fabric boasts itself about being tough and rugged, it still requires a good care to use it for coming years as well. Due to its weave structure it often pick up dirt and stains that can get hard to remove. Make sure you take your tweed clothes for dry cleaning as washing them in washing machines can make them shrink. Also, keep them in cool dry place so that they do not get attracted by moths.

"

Comment by leilei3915 7 weeks and 3 days ago

Your point of view

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