A filesystem is a way to organize and store computer files with their data.

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Why are directories created with permissions 2070 and files with 060 in a directory with setgid bit?

I have the following directory: $ ll -d neptune drwxrws---+ 5 beamin psych 4096 Mar 7 16:18 neptune $ getfacl neptune # file: neptune # owner: beamin # group: psych # flags: -s- user::rwx ...
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How to write a file at various offsets to a filesystem partition with dd command

Requirement I want to write a file at various offsets into the partition Partition /dev/part2 is mounted at /mypart I tried the command below: dd if=/dev/urandom of=/mypart/aaa bs=1024 seek=0 ...
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What happened to my ext3 partition

I had an ext3 partition. I ran a dd command like this: dd if=/dev/urandom of=/dev/part2 bs=1024 count=15000 seek="various values" Where various values are basically 0, 15000K, 30000K etc. The ...
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Recovering ext4 superblocks

Recently, my external hard drive enclosure failed (the hard drive itself powers up in another enclosure). However, as a result, it appears its EXT4 file system is corrupt. The drive has a single ...
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798 views

du reports surprising total size for same data

Don't worry, this isn't typical "du vs. df" question. :-) I mounted a squashfs image (via loop) and used du to reported the size: du --apparent-size -lsh image1/ which reported 215M. Then I used rsync ...
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Mounting multiple devices at a single mount point on Linux

Is there a way to mount multiple hard drives to a single mount point? Let's say I run out of space on /home and decide to add an extra hard drive to the computer. How do I scale the space on a mount ...
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670 views

How can I automatically chown a file to the user who made the modification?

I've set up a shared directory structure for users accessing a common set of files. Files created by a user are owned by that user (the group is inherited from the parent directory), so the team knows ...
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delayed write in operating file system

I read in some papers about NFS and Sprite that a system can use delayed writes when a client writes something to the server. I would like to know what is the purpose of this technique?
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Why is my file system mounted as read-only?

I've put together a small system with busybox, a Linux kernel, and a small file system, putting stuff in as it seemed necessary -- I don't know if I've been learning much from this, but I started out ...
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Recover deleted file that is currently being written to

I started downloading a big file and accidently deleted it a while ago. I know how to get its current contents by cping /proc/<pid>/fd/<fd> but since the download is still in progress ...
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Which Linux file systems for USB sticks?

For Linux desktops, when Windows compatibility is not an issue, which file system is preferred for USB sticks? For example ext2, ext3, ext4, btrfs, nilfs, or even NTFS? Would journaling wear them out ...
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Testing ext3 filesystem on embedded device [closed]

My set up: An embedded device with flash memory on it. Flash is partitioned into ext3 filesystem partitions. Have busybox on it. My Goal: To uncover errors /bugs/ problems on ext3 filesystems. ...
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Why can't I copy my DVD with dd?

I tried dd, dd_rescue and ddrescue, all failed. I thought these tools bypass the filesystem and make a bitwise copy. dd is fooled, it finishes but just produces a small file and states it's finished. ...
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Case-insensitive file system for production server?

The initial situation looks like this: The corporate software is PHP-based. It is delivered by Apache 2 on a Windows 2003 Server. It is big. It is a legacy of rather unprofessional developers who ...
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How to Expand LVM2 Partition in Fedora Linux

I've been using Fedora 15 on a VMWare virtual machine. Over time, the disk space I initially allocated for the file system began to run out, only 12GB left. I've expanded the disk space an extra 25GB. ...
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What does the following kernel message mean?

The following appears /var/log/messages, what that means ? Feb 19 22:51:20 kernel: [ 187.819487] non-matching-uid symlink following attempted in sticky world-writable directory by sh (fsuid ...
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Embedded device: How to do raw reads and write to flash (emmc/movinand) bypassing file system cache

I have an embedded device with a flash memory running linux. I want to do raw read writes on the flash part but I also want to avoid any file system cache. How can I do this? Any pointers?
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Which file system to choose for small sized files?

I have a partition and it has ~100 GB of audio files. Most of them are mp3 or ogg, each has size of ~15 MB. I update it on a weekly basis. Right now, the partition is formatted as ext4. I have read ...
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Create iso image of ext3 type

I want to create an ISO image which can be mounted with an ext3 partition type. How can I do that? I am using this command: [root@manage upload]# dd if=testParti.txt of=./diskImage.iso 41+1 records ...
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Is there a file search engine like “Everything” in Linux?

On Windows there a nice file search engine called Everything, which is (unlike find) very fast and (unlike locate) always returns up to date results. AFAIK it works by filling a database from the ...
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What is “blocking” in reference to file I/O?

My textbook mentions it but doesn't specifically define it. From the context it's used in (in this example, pipes), I take it to mean that if one end of the pipe blocks, it's temporarily "disabled", ...
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Simultaneously move long list files to new location

I'm using a wonderful program called ExifTool to recursively rename a large batch of files. Here is example usage: $ exiftool -r -ext JPG '-FileName<CreateDate' -d %Y%m%d_%H%M%S.jpg . Error: ...
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In Mac OS X Snow Leopard, how can one file's permissions be matched to another?

I need to make the permissions of a file exactly match the permissions of another file in OS X 10.6. I don't see 'getfacl' or 'setfacl' as suggested in some other posts for Linux. And, it doesn't ...
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Too many open files in system in FreeBSD 9

I just installed FreeBSD 9 version with GNOME interface. Each time I want to open a folder from root a message box pops up and warns me with this message: Too many open files in system. What is the ...
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Is there a tool to visualize a filesystem allocation map on Linux?

May you have ever used filesystem defragmentation tools (like Norton SpeedDisk or Piriform Defraggler) on Windows, you have probably seen such a diagram: It displays a filesystem sectors map, ...
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Can I configure my Linux system for more aggressive file system caching?

I am neither concerned about RAM usage (as I've got enough) nor about losing data in case of an accidental shut-down (as my power is backed, the system is reliable and the data are not critical). But ...
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Mount device with r/w access to specific user

How can I mount some device with read-write access to specific user?
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Not enough space on / to install new kernel update

During a recent update I received this: Installing: kernel-default-2.6.37.6-0.11.1 [error] Installation of kernel-default-2.6.37.6-0.11.1 failed: (with --nodeps --force) Error: Subprocess failed. ...
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skype not found on Oneiric 64, but it is right there [duplicate]

Possible Duplicate: Can't execute some binaries in chroot environment (zsh: Not found) I have something weird here. Cannot find a file although it is right there. $ skype command not ...
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bash force copy over same file

Our sysadmin has created a backup system that creates snapshots of the hard drive. When I try to restore an older version from the snapshot: cp /path/to/snapshots/foo.bar /path/to/folder/foo.bar ...
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How to create an FS under SunOS?

So there is a global zone, and we need to create an FS on a non-global zone. Also we need the new FS in a new DG/Volume inside the DG of the zone (if we see it from the global zone). How to do it? ...
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Mounting Remote Filesystem over SSH as a Different User

Due to a breach of security, the administrators of the work server have implemented a new method of security. To log into the server, we must log in as our own user (which has severely limited ...
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Can I move a directory with open files?

Imagine a bunch of processes using a /home/user/logs directory. They have some logs open for a longer time.
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The volume “boot” has only 0 byte disk space remaining

I am in Ubuntu 10.04. When I install the software updates with "Update Manager", there is a pop up dialog which tells me "The volume "boot" has only 0 byte disk space remaining" How to get rid of ...
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How to understand the filesystem concepts used by encfs?

I do not hold a deep understanding of computer science concepts but would like to learn more about how the utility encfs works. I have a few question regarding the concept of filesystem in regards to ...
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Directories with binary files in Linux

I noticed that when I install new application there are a few possible directories where the resulting binary file will be placed. You can install with packaging manager, compile with make, ...
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file block size - difference between stat and ls

I've noticed that when I do a: ls -ls file It provides block count, say 8 blocks. When I do: stat file I notice that the block count is 16, twice the number given by ls. The block size on my ...
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What is the most high-performance Linux filesystem for storing a lot of small files (HDD, not SSD)?

I have a directory tree that contains many small files, and a small number of larger files. The average size of a file is about 1 kilobyte. There are 210158 files and directories in the tree (this ...
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1answer
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Sparse files/file holes and unexpected block size

For my own learning, I've been playing around with creating files with file holes. I created a util that simply reads from stdin and writes to a file, but before writing to the file, it uses lseek to ...
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How to detect and stop user from deleting particular file on Linux?

Is it possible to monitor user actions on the file system and prevent him from performing particular actions? Can inotify only monitor actions on the file system? What about fanotify? There's very ...
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Is there a way to sync only one partition?

Is there a way to sync only one partition instead of all partitions? Something like "sync /dev/sdc1".
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1answer
2k views

/etc/fstab is mounting rw filesystem as read-only

A partition of my internal hard drive (not the root partition) I want to mount automatically on boot. I've been using /etc/fstab to mount my external backup drive automatically read-only, so this is ...
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How to make a variable symlink ? (or something similar)

How can I make a variable symlink that would point to a different location according to the current user? Is it possible? Should I use something else instead? A mount point? How? Here is the problem ...
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5answers
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how to mount this disk?

I'm trying to mount a disc created some time ago in Amazon EC2. This is what I see (line breaks added for the sake of readability): $ sudo file -s /dev/xvda4 /dev/xvda4: x86 boot sector; partition 1: ...
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Immutable bit on AIX?

Under Linux I can: chattr +i SOMEFILE so that even root can't modify the SOMEFILE. Are there any similar solutions for AIX?
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Copying a file that is written at the same time

This related question can't solve my exact problem, so I'm writing a similar question. My scenario is the following: a program (run by wine) writes to a file sized about 10-500 KB. About 1 KB ...
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trouble with irssi and cifs

I'm having trouble getting irssi, the irc client, to write to a mounted cifs share. I have the uid, and gid set to my user as well as setting the permissions on the share to being very permissive. ...
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System crashes during boot while mounting /lib/init/rw

After a nasty crash, my system keeps crashing during boot. After a little bit of investigation I have discovered that it crashes executing the following function (in /lib/inin/mount_functions): ...
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ReFS but for Linux

Microsoft is going to bring a "Resilient FileSystem" with Windows 8, but only for servers. I'd like that on a Linux desktop, but my search reveals no contender. There are so many filesystems for ...
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Mount a filesystem read-only, and redirect writes to RAM?

Is it possible to mount a loopback file as read-only, and redirect all writes to RAM?