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

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Circumvent permissions of filesystem on an external drive

Suppose that I have only non-root access on a desktop Linux machine. I want to work with an external, pluggable storage device (hdd, flash drive or memory card) with an ext{2,3,4} file system. Since ...
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1answer
66 views

see actual partitions usage

I have recently learned that ext3 (or some other filesystems) reserve some space of a drive by default for previliged processes. One can change this by doing the following: # tune2fs -m 4 /dev/sdXY ...
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3answers
440 views

Can a mounted encrypted filesystem be safe from root?

I have access to a shared remote computer from which I would like to run some code I have written which uses an interpreter (not a compiled code). I would like to protect this source code from other ...
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1answer
212 views

What is Linux for OpenVMS DIRECTORY/NOHEADING/NOTRAILING?

OpenVMS DCL command DIRECTORY/NOHEADING displays just the full file name including path info in a single-column format without any of the normal headings for a directory listing. The /NOTRAILING ...
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2answers
522 views

How can I be sure that a directory or file is actually deleted?

I know that most files, when deleted, aren't actually removed from the disk, and can be recovered later. How can I ensure that a directory I had deleted will actually be removed from the disk? Are ...
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0answers
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How to set up ZFS with ZIL and L2ARC SSD?

I have been considering bcache and flashcache. However my friend suggested me something called ZFS. In fact it says that formating disk with ZFS can actually do the exact same thing without kernel ...
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2answers
2k views

Storing thousands of files in one directory

I have a web-site that I'm checking for performance issues and bugs, and i came across a caching code that caches thousands of files into one single directory. I understand that this is not good and ...
29
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1answer
10k views

Purpose of /dev/zero?

I tried to cat /dev/zero, and it didn't seem to do anything. I googled /dev/zero, and it says it's basically a blank file with infinite size. Is cat printing an infinite number of non-existent ...
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1answer
4k views

Resize ext4 partition to create more inodes? [duplicate]

Possible Duplicate: How can I increase the number of inodes in an ext4 filesystem? An old headless no-X backup server I use has a small hard drive with three primary ext4 partitions: /, ...
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1answer
3k views

updating `/etc/resolv.conf` on a read only filesystem

I currently have a busybox based embedded linux system. The filesystem is a readonly mounted jffs2 filesystem. One problem I've run into is that /etc/resolv.conf can't be updated by DHCP. Is it ...
3
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1answer
97 views

Emulating a file

I have certain application that opens a file with given path (presumably with fopen or derivative), reads the file, possibly writes to it and closes it. I have no control over this application other ...
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4answers
65k views

Best way to mount remote folder

I have two RasberryPi running debian wheezy and I would like to mount a folder from computer A on computer B. What is the best (as in most efficient) way to do this? I can do it via SMB, but that is ...
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5answers
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Tool to compare files on one disk with registry information on another?

Been a long time since I got very far under the hood in Unix so I'm probably not even using proper terminology when I say 'registry,' but here's the situation. I have a disk thats dying. Lots of i/o ...
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3answers
2k views

Securely delete files on btrfs filesystem

Sometimes, there's the need to delete a file in a filesystem, and make sure that the file is truly gone. A file that contains sensitive passwords, for example, should be throughly wiped from the disk. ...
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2answers
8k views

How do I remove a file with no permissions?

A hacker has dropped a file in my tmp dir that is causing issues. Nothing malicious except creating GB's of error_log entries because their script is failing. However, the file they are using to ...
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2answers
1k views

FHS differences between OS X, Linux and FreeBSD

I've read that there is a different behavior between FreeBSD and Linux with the /usr/local, in FBSD ports are installed there, in Linux not, can someone explain more on this? I'd like to know where ...
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2answers
479 views

Problem mounting my iRiver story HD on Ubuntu

I would like to connect my iRiver Story HD to my ubuntu 12.04 machine but as I connect it I get this error: Unable to mount Story HD Error mounting: mount: wrong fs type, bad option, bad ...
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3answers
6k views

Why are text files 4kB?

For some reason, when I make a text file on OS X, it's always at least 4kB, unless it's blank. Why is this? Could there be 4,000 bytes of metadata about 1 byte of plain text?
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1answer
317 views

What parts of the filesystem to tmpfs/squashfs/sparseimage for USB live system

I want to create a live system on a USB key / SDCard with Linux Mint 14 (KDE or Debian Edition) that stores data persistently. The USB key needs to have at least one fat32 partition. As storage for ...
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0answers
46 views

Move files replacing? [duplicate]

Possible Duplicate: ‘mv’ equivalent of drag and drop with replace? I'd like to take a folder /a/b/c, and copy all files in /a/b/x into /a/b/c, replacing all files in /a/b/c with the ones in ...
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1answer
246 views

Cannot execute files on another partition

On my system I have three partitions: one is shared between W7 and Linux Mint (NTFS), and the other two are OS-specific. In my home directory I have created a symbolic link to another directory on ...
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2answers
2k views

Location of inodes (ext)?

Say I want to observe how the flow from file name to cluster on hard disc goes. I get the inode number of I file (which is mapped in a directory data): 1863 autorun.inf So, now i know that i have ...
4
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1answer
962 views

What do GDIR, GREG, VDIR, VREG mean in lsof output

The lsof manpage says the following about the TYPE column. TYPE is the type of the node associated with the file - e.g., GDIR, GREG, VDIR, VREG, etc. Can someone please explain (or point ...
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4answers
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What are the advantages of the Unix file system structure

If I install an application in Linux for example Debian/Gnu Linux, the files of the applications are copied to many different directories in the file system. Some scripts goes into /usr/share .. ...
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1answer
588 views

The relationship between execute permission on a directory and its inode structure

My question deals with the relationship between the read and execute bits on a directory. I'm going to give my assumptions, first, all according to my current knowledge, then ask my question in bold ...
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3answers
2k views

Read a directory to see the file to inode mapping

I'm just learning about filesystems and it is said that a directory is just an ordinary file which keeps a list of file-inode pairs. If I try to open the directory Downloads with any of the following ...
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1answer
698 views

Filesystem with 1Mb block?

I'd like to make a partition for keeping ISO images of nightly builds. Most of files will be bigger than 1Mb. Unfortunately ext2/ext3/ext4 supports only 4Kb blocks. # mkfs.ext4 -b 1048576 -L DISTR -m ...
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2answers
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Create and format exFAT partition from Linux

Is it possible to create and format an exFAT partition from Linux?
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2answers
94 views

Download copy of file which updates on change

Sorry about the title, I didn't know how to write it - It's kind of confusing. Ok, I am using my Raspberry Pi (Debian) and I store code on this server in which people have access to. My problem at ...
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1answer
1k views

How can I set a directory maximum size?

Is there an easy way to cap the size of a directory? I don't think there is but just wanted to make sure. I would like to set max directory sizes for some user home dirs as well as some other dirs, ...
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1answer
153 views

How do I give global access to a file in a private folder?

For example, I want all the files in /home/trusktr/Downloads/ to remain hidden from other users, except for one. I tried chmod 777 /home/trusktr/Downloads/someFile.avi but someFile.avi is still ...
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4answers
4k views

Optimal Setup for Windows & Linux - Sharing and Partitioning

This question gets a little complicated so please bear with me. So we have a new custom designed desktop which we will be mostly a dedicated machine for scientific computations in FORTRAN and ...
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1answer
254 views

Will kjournald takes too much space?

I am changing my hard disk to ext3 because journalling got so much write my server crash. Well, now I use SSD. Journalling is no longer the issue. But SSD are small. Will journaling takes so much ...
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1answer
2k views

Identify text/ascii files in Linux/Solaris

I have a little project to build bash script that search in the OS ( Linux/Solaris ) the current IP address from files and replace them with other IP address. The problem is that IP address could be ...
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0answers
188 views

Directly convert Archbang live on a USB drive to one such with persistent file-system

I have installed Archbang 2012.12.03 from ISO image on my USB drive, now I have a USB drive with a live Linux installed on it but at end of every session and rebooting system I faced with a fresh ...
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1answer
7k views

EXT4 FS needs journal recovery. What does this mean?

$ sudo file -s /dev/sdb1 /dev/sdb1: Linux rev 1.0 ext4 filesystem data (needs journal recovery) (extents) (large files) (huge files) What does "needs journal recovery" mean? Do I need to do ...
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0answers
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Creating a Virtual filesystem to boot linux

I am trying to boot the linux kernel (bzImage) in QEMU but have had issues. After asking on U&L I found out that my problem was that I was booting the kernel without a filesystem to boot from. So ...
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1answer
1k views

How to find the type of an img file so it can be mounted

I have a .img file and I want to see what's inside of it. I tried mounting it, but I don't know what filesystem type it is. Is there a way to detect what it is so I can mount it? I'm using Ubuntu. ...
4
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1answer
594 views

Virtual file made out of smaller ones (for mac-like sparse bundle solution)

I'd like to recreate a feature of Mac OS X called sparse bundles (disk images made out of smaller files, making them easy to backup after a small change). For that I'm looking for a way to ...
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3answers
2k views

How do I point certain directory to /dev/null?

I am running CentOS with cPanel, which creates a custom log directory and writes the logs there. The result is that the IO for the hard disk goes sky high. If I do lsof I got: hostsite.com httpd ...
4
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1answer
158 views

How can I get a total for space used by a group of subdirectories

My file system is set up like: /ftp/data/ProductGroup*/ProductType*/Year*/Day*/ActualProductFile* ("*"denotes directory names that change) I'd like to find out how much space is being used for ...
27
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3answers
21k views

File system compatible with all OSes?

I use Linux and Mac OS X on a regular basis, and sometimes I have to use Windows. I need to use a flash drive on all three, and I need a filesystem that will work well on all of them. None of the ...
2
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1answer
83 views

Listing script's file dependencies

Given a shell script, is there an easy way to extract what files it manipulates explicitly (so not like concatenating some command and than eval-ing it)? E.g. #!/bin/bash . /etc/someconfig.cfg ...
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1answer
240 views

How to re-size partitions in a complete hard drive image?

I have taken a complete image of a hard drive using: dd if=/dev/sda of=/home/user/harddriveimg bs=4M It would seem to me, that I should be able to re-size the partitions within it after suitably ...
3
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3answers
2k views

How is GRUB able to read it's config file on ext3 fileystem?

I have read that GRUB can read ext2 filesystems and has modules for doing this. What is the location of the mod on a Redhat system and how about if the /boot partition is ext3/ext4 or other filesystem ...
3
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2answers
2k views

Filesystem monitoring

A script where we need to come up with a way for the disk space monitoring to be smarter. On smaller file systems, we still want to alert at 90% full, but on larger file sytems, we should only alert ...
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2answers
1k views

Why is cd not a file in /bin? [duplicate]

Possible Duplicate: Why is cd not a program? I noticed that every other commonly used util, like ls, cp, rm, etc. are actually files in /bin -- but cd is not. Nor is it in any other ...
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How can I access (including read and write) a linux file system from a windows machine on the same network [duplicate]

Possible Duplicate: How to share files between Linux and Windows? I have a Linux virtual machine (Hyper-V) acting as a web server on my network. I would prefer to browse it's file system ...
2
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4answers
181 views

Is there a structured format of version info for OS-level executables?

I am looking for a structured format of version info for OS-level executables, such as in /usr/bin and /usr/local/bin. The problem we are having is the inconsistent architecture between our PROD and ...
2
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0answers
233 views

Can a FAT32 and NTFS file system exist without UUID?

I have an USB disk drive partioned with 2 FAT32 partitions, which is not getting detected in the embedded device, but gets detected in a Fedora system. Basically in the udev rules, I am not able to ...