Questions dealing with Ubuntu's layout of files, permissions, and files that reside in special locations on disk.

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3
votes
1answer
62 views

Is it possible to change the filesystem type of the Compact Disc (CD) in linux using terminal commands?

I have a new Compact Disc (CD) which is sony(rewritable) and its Filesystem type is UDF. Now it is possible to change it to CDFS filesystem using terminal commands or any other software? The reason ...
6
votes
2answers
1k views

Why there are 2 directories having same content?

cd /proc/$$/root/bin cd /bin After running ls command on both the directory, I found that content of both directories are same (which is nothing but list of commands). Is there any specific reason ...
2
votes
0answers
32 views

What is the partition type ('t' command) in fdisk good for?

I can't understand the difference between the filesystem specified using fdisk's command line interface with t. And the one used to format it later using say mkefs. Why do we need to specify it ...
1
vote
1answer
36 views

When copying files via USB from Ubuntu to Windows 7, there is a different number of files

What's up guys, I'm trying to backup some Ubuntu files to my Windows machine. I have all the files in one folder and when I click "Properties" in Ubuntu it says 696 items, 742.6 MB. When I copied that ...
0
votes
0answers
8 views

Writemode journalling mode

From what I understand in data mode both inode and file data are stored in journal and in ordered mode only inode data is kept in jounral and removed after file data is successfully written. What I ...
8
votes
2answers
2k views

I have a file named “-t”. How to remove it? [duplicate]

Output of "ls -l": -rw-r--r-- 1 root root 0 Mar 4 08:22 -t When i try to do "rm '-t'": rm: invalid option -- 't' Try 'rm ./-t' to remove the file '-t'. Try 'rm --help' for more information.
8
votes
1answer
385 views

How does ctime change?

I'm trying to precisely understand when the ctime timestamp of a file is changed. In many places (e.g., in the accepted answer here) it is suggested that any change in the file attributes will also ...
0
votes
0answers
106 views

Why does lsof complain about tracefs?

Every execution of lsof issues a warning about the TraceFS: $ lsof any-file lsof: WARNING: can't stat() tracefs file system /sys/kernel/debug/tracing Output information may be incomplete. $ ...
0
votes
1answer
50 views

In which system file does 'export' command make changes?

I installed java-8 using a PPA. After that I gave a command: export JAVA_HOME=/usr/lib/jvm/java-8-oracle I had heard somewhere that this command does temporary changes. But after many logouts and ...
0
votes
2answers
10 views

troubleshooting updatedb

I am taking a course that makes me go on terminal and run updatedb. but this is what I get: nonrootuser$ updatedb updatedb: can not open a temporary file for `/var/lib/mlocate/mlocate.db' so far I ...
1
vote
1answer
193 views

ext4 broken file system on ubuntu 14.04.4

I have a desktop computer with Ubuntu Desktop 14.04.4 LTS 64-bit with an attached HDD USB 3.0 4TB Intenso 1 partition ext4 data drive only (no OS or Apps). After a sudden power failure I am unable to ...
0
votes
0answers
28 views

How to get to the right directory?

In sitting with Ubuntu mate 15.10 xx@ThinkPad-X250:~$ cd Desktop bash: cd: Desktop: No such file or directory xx@ThinkPad-X250:~$ cd downloads bash: cd: downloads: No such file or directory How ...
4
votes
2answers
102 views

Accidentally installed ubuntu on the whole disk instead of a specific partition

I had Linux installed on my laptop with 3 partitions: [System: 100Gb Ext4 Mount Point / ] [Data: 400Gb Ext4 Mount Point /media/Data] [Swap: 8Gb Swap] I needed to reinstall my system and wanted to ...
1
vote
0answers
27 views

After crash I get an unknown filesystem error

Today my PC crashed (I was kinda expecting it cos Firefox and full screen videos kinda crash my PC) and when I rebooted I got an error saying unknown filesystem. I booted to a live USB and the ssd ...
1
vote
0answers
33 views

USB read-only via graphic UI and writable via CLI

Why I'm unable to write on USB via Files (Nautilus, graphic UI) and I'm able to write on it using CLI? Using Files I'm getting the error: Error while copying to "DEVICENAME". This destination is ...
0
votes
0answers
11 views

What should be compared with ullimit -n

I know that max number of opened files per user is set in $ ulimit -n What is the right way to get a number to compare it with? My guess would be $ lsof | grep "REG" | wc -l but this number ...
1
vote
0answers
39 views

Need help extracting data from a floppy disk formatted by an old drum machine

Alright, for context I make music using an old drum machine which uses 3.5" floppy disks (Emu SP-1200) and I am trying to take a look at what the OS binary and sound file formats are like. But I'm ...
2
votes
2answers
1k views

'cat': can't open file: Permission denied

I am trying to copy the whole / directory to some other location. When doing cp recursively, it fails on some files like:- / # ls -lrt /sys/module/nf_conntrack_ipv4/uevent --w------- 1 root ...
0
votes
0answers
46 views

Unable to mount root filesystem after cloning volume with dd

I am trying to clone a Ubuntu install on an 8GB SD card. I created an image of the volume using dd, then copied this image onto another SD card using dd again. The SD card contains 2 partitions: a ...
0
votes
1answer
155 views

How do I expand my filesystem? I have Ubuntu MATE on a Raspberry Pi 2

I have Ubuntu MATE on my 32gb micro SD card using a Raspberry Pi 2. I really need to know how to expand my file system. I looked it up, but all I got was an error (value out of range). I will list ...
0
votes
0answers
21 views

init.d location

I was looking through "man hier" but did not find the location of the folder init.d. The issue is that, it suddenly appeared in my home directory and has a little lock as if I am not able to access ...
3
votes
1answer
24 views

I have software (blender 2.76b) running as an “executable” from my home/documents folder. Should I move it to opt? ( (k)ubuntu 14.04)

I'm running (k)ubuntu 14.04 and everything I've read tells me to install 3rd party software in opt. everything is working fine but I want to know if I'm going to encounter problems later with add-ons ...
0
votes
1answer
21 views

How to run an application on a disk partition ubuntu

I have loaded /dev/pmem0 filesystem on /mnt/ramdisk. output of df command: Filesystem 1K-blocks Used Available Use% Mounted on /dev/pmem0 307200 4120 303080 2% ...
0
votes
1answer
48 views

Symlink does not work for dropbox

I am backing up home folder by create a symlink in dropbox. What I did: cd ~/Dropbox mkdir backup && cd backup ln -s ~ What I checked: ln -l. The symlink is created. The dropbox folder ...
0
votes
0answers
12 views

Is there any downside to using hardlinks over copying?

Let's say I have a large file (over 1 GB) I want to copy to another place on my partition. Is there a downside to just creating a hardlink (ln /path/to/large/file /path/to/target) instead of using ...
0
votes
0answers
26 views

Giving r-x permissions to directories of other users

I have an Ubuntu 14.04.1 server with the such permissions scheme (given below in user:group format): root: root super: sudo master master1: master master2: master user1: simple1 user2: simple2 ... ...
0
votes
0answers
19 views

How file advisory locks in Unix system prevent unlrelated process from corrupting data?

I'm reading about Linux OS system (which is the kernel for Ubuntu) and reached the notion of advisory locks. According to Wikipedia, a programmer can use these locks if he wishes to do so, but he ...
0
votes
0answers
44 views

“sudo btrfs filesystem defragment -r /” can't defrag immutabe files, right?

Files made immutable by sudo chattr +i can't be defragmented by "sudo btrfs filesystem defragment". I get the message: "ERROR: defrag failed on /path/filename: Success total 1 failure" Is this a bug ...
0
votes
0answers
12 views

Bad practice to keep many subdirectories in single directory [duplicate]

I was wondering if it is bad practice (or performance, etc.) to keep many (10k+) sub-directories in a single directory. Is it better or the same to group those sub-directories into more ...
0
votes
1answer
57 views

Unable to access “136 GB Volume”

This error message is shown every time I try to access the flash drive. Error mounting /dev/sdc1 at /media/hp/868E-F233: Command-line`mount -t "exfat" -o ...
0
votes
1answer
67 views

How do I link the OpenAL library to eclipse in Ubuntu?

I just downloaded the OpenAL library using the command sudo apt-get install libopenal1 libopenal-dev, now I can't find where the library is on my system and how should it be linked with Eclipse. I am ...
0
votes
0answers
13 views

How to find the first device address of request using blktrace?

I have traces of running an "f2fs" on an usb-drive. I would like to use them as inputs to DiskSim. DiskSim requires the first block number that has been traced. Is there a way I can find that by ...
0
votes
0answers
31 views

The volume “Filesystem root” has only 0 MB

Yes this is a question that on surface has been asked previously. The difference with this question is that all the answers supplied make no results that work to fix this problem. I read, understood ...
1
vote
0answers
20 views

Ubuntu 15.10 doesn't seem to support sparse files

On Ubuntu 15.10 using ext4 when I perform truncate -s 512M test.img du -h test.img the output is 513M test.img however if I run du -h --apparent-size test.img the output is 512M ...
0
votes
0answers
26 views

xfs on raid0(mdadm) proper mounting

Reading manuals on howto tune xfs on raid is totally crazy. In my case I have raid0 of 2 disks with 512K chunk size. Physical disk block size is 4096 The correct su and sw should be su=512k and sw=2? ...
0
votes
0answers
21 views

How do I move a .iso file to root in Ubuntu? Tells me I do not have permissions

To create a bootable sd card I need to move the Ubuntu.iso to root so that Unetbootin will see it. The system tells me I do not have permissions.
1
vote
2answers
32 views

File system goes read-only when using file explorers

I have a problem with my 15.10 system and it goes as follows: When using Nemo or Nautilus (these are the two I've tried) works fine as long as I explore my home directory only. Visiting 'File ...
4
votes
3answers
464 views

Size of device file ( missing in ls -l output )

When I try to print the device file output shows binary data in hexadecimal format. But upon doing a ls -l /dev/sda I get: brw-rw---- 1 root disk 8, 0 Jan 29 12:29 /dev/sda I don't ...
1
vote
1answer
32 views

Mount a disk at different points

What if I mount the same disk at two locations using different file systems? Will they just be like hardlinks referring to the same location or would it cause any issues? ex: # mount -t ext3 ...
1
vote
1answer
53 views

Switching back to read-only filesystem

I am using the Nexus 4 with UbuntuTouch installed. I switched to a writable filesystem by this command: sudo mount -o remount,rw / and it worked perfectly. How to switch back correctly to ...
2
votes
2answers
75 views

mounting error to access the drives in ubuntu 15.04

While trying to mount the drive it showing me an error like below...and  drive is not being mount ... “ Error mounting /dev/sda3 at /media/ubuntu/B840AE6C40AE30D4: Command-line `mount -t "ntfs" -o ...
1
vote
3answers
116 views

How to make a line of directories with one command?

With the mkdir command if I want this location to exist ~/test/panda/fat when only the ~ part of it exists so far I have to do something like this: mkdir ~/test mkdir ~/test/panda mkdir ...
0
votes
1answer
53 views

Recover unreadable directory on ext4 partition

One of my directories in a ext4 filesystem on my SSD became unredable and I need to recover the files. Here is what I did to crash the filesystem: I accidentally created 1.5 million small files in ...
0
votes
0answers
32 views

mount xbox 360 formated disk

I have a game save data on a usb pen drive. Ubuntu doensnt recognize the disk file system though. I used the command fdisk -l, and tried installing netware 386 packages, but the disk still wound ...
1
vote
1answer
80 views

How to format a FAT32 USB as EXT4

I have a USB device /dev/sda1 and I want to format it as ext4. I have tried sudo mkfs.ext4 /dev/sda1 It gives warning, goes ahead and completes formatting without error. But when I check it using ...
1
vote
1answer
78 views

After update chrome won't open desktop is read only

I'm running Ubuntu 15.10 and just did a software update via the software update manager. Now chrome will not open neither will Firefox and if I try to copy anything to my desktop I get an error ...
1
vote
0answers
25 views

Directory converted to a file

I have an external HD formatted to ext4. Somehow a directory is now showing up as a file (i.e. it is missing the 'd' in the attributes). fsck does not show any errors. I don't believe that the ...
0
votes
1answer
34 views

WD Passport external device not recognized

I am getting following error when I connect my external HDD. Error mounting: mount exited with exit code 13: The disk contains an unclean file system (0, 0). The file system wasn't safely closed on ...
0
votes
0answers
36 views

SFTP access and editing files outside the home folder

I would like to be able to edit all files on Ubuntu server 14.04 using Filezilla and SFTP. Is there another way to do that except connecting with root user ? If I connect with other user, then I ...
0
votes
0answers
90 views

“My Passport” USB Drive corrupted

My Passport drive corrupted. When I type: dmesg | tail I get: [ 667.778316] sd 6:0:0:0: [sdb] CDB: Read(10) 28 00 00 00 00 00 00 00 08 00 [ 667.778321] blk_update_request: I/O error, dev sdb, ...