lndir sourcedir destdir

Propagate a directory to another and create symlink to content

Lndir create from source directory to destination directory a full symlink tree of all contents of source directory, really useful for propagate changes from a directory to another.

2009-04-24 18:30:29

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    perl -le 'opendir DIR, "." or die; print while $_ = readdir DIR; closedir DIR'
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  • If you want to create fast a very big file for testing purposes and you do not care about its content, then you can use this command to create a file of arbitrary size within less than a second. Content of file will be all zero bytes. The trick is that the content is just not written to the disk, instead the space for it is somehow reserved on operating system level and file system level. It would be filled when first accessed/written (not sure about the mechanism that lies below, but it makes the file creation super fast). Instead of '1G' as in the example, you could use other modifiers like 200K for kilobytes (1024 bytes), 500M for megabytes (1024 * 1024 bytes), 20G for Gigabytes (1024*1024*1024 bytes), 30T for Terabytes (1024^4 bytes). Also P for Penta, etc... Command tested under Linux. Show Sample Output

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  • This will create a 10 MB file named testfile.txt. Change the count parameter to change the size of the file. As one commenter pointed out, yes /dev/random can be used, but the content doesn't matter if you just need a file of a specific size for testing purposes, which is why I used /dev/zero. The file size is what matters, not the content. It's 10 MB either way. "Random" just referred to "any file - content not specific" Show Sample Output

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    mkisofs -o XYZ.iso XYZ/
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  • Simple and easy to remember, if it already exists then it just ignores it.

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What Others Think

Awesome! I never knew about this...
bwoodacre · 473 weeks and 2 days ago
FYI, lndir is part of the xutils-dev package, at least on debian/ubuntu, which is then pulled in by xutils, which is a basic X package.
bwoodacre · 473 weeks and 2 days ago
Just use cp -rs.
kFiddle · 473 weeks and 1 day ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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