A loop device allows any file to be mounted as a filesystem image. Not to be confused with a loopback interface in networking.

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how to add a loop device on fedora 23 with losetup?

in an attempt to access a truecrypt container, I stumbled about the prerequisite of setting up a loop device... ncoghlan suggested in an earlier answer When you run it as root, losetup -f will ...
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1answer
521 views

Why is my loop not continuing properly in my rock paper scissors game?

I'm making a bo3 rock paper scissors game. So far I've gotten it to work under every condition except ties. When a tie happens, it's meant to 'remake' that game by just subtracting 1 from I. It doesn'...
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3answers
88 views

Bash array values like variables inside loop

Im trying double loop using array values like array names for loop array1="name1 name2" name1="one two" name2="red blue" for name in $array1 do for value in $name do echo "$name - $value" ...
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2answers
31 views

troubles working on a script with $# and a loop

i have the following script: #!/bin/bash for ((i=1; i<=$#; i++)); do if [ ! -d $i ] then echo $i its not a directory >> file.txt else ...
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19 views

Prevent loop device partitions from being detected

I'm moving a work project from RHEL 6 (Kernel 2.6.32) to RHEL 7 (Kernel 3.10.0). The project involves the building of a raw disk image files to be used on virtual machines, these are representative ...
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9 views

Red Hat Enterprise Linux 6.7: Turning off wi-fi forcefully unmounts a loop drive and crashes a VM

I am running Red Hat Enterprise Linux 6.7 on a Lenovo ThinkPad T430 and I have QEMU-KVM 0.12.1 installed on my computer. I have an external hard drive encrypted with dm-crypt and formatted as Ext4, ...
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46 views

Overhead of using loop-mounted images under Linux

Is there a CPU/RAM overhead associated with using loop-mounted images versus using a physical partition under Linux?
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48 views

Loops: for vs while… beyond the basics. Subtle differences/pros/cons for my code? [closed]

I have been writing/refining a relatively complex code for the past year, and learning bash along the way. My code is filled with functions that have complex multi-level while loops. I've recently ...
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56 views

CentOS7 Livecd login loop after Dracut update to 033-360

I am trying to edit the official CentOS7 livecd build 1406 and after updating Dracut to 033-360 (due to being an nfs-utils dependency) from the original 033-161 I am stuck in a login loop. Further ...
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2answers
51 views

In a bash shell script , how to write a loop that goes trough three values [duplicate]

I'm trying to write a shell script using bash for the following problem: Write a loop to go through three values (A B C) and displays each of these values to the screen (hint use a ‘for’ loop). ...
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3answers
41 views

Can I use variable in a .csv file in the for loop?

I am trying to replace these numbers "A00002 X53307 BB145968 CAA42669 V00181 AH002406 HQ844023" in the following for loop with a new list of numbers. But my new list is a .CSV file and there are ...
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2answers
443 views

What file is mounted on loop0?

Today I noticed that some time in the past I mounted an ISO, but forgot which one it was: /dev/loop0 on /export/production/os/iso/centos/mount type iso9660 (rw) How can I find the exact file name ...
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1answer
38 views

My if bash script always execute the break

I`m making a script to rename files in a folder. The new name for the files is in a config file. I have to be sure that the file I want to rename corresponds to the current one in the config file. My ...
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1answer
195 views

How to mount qcow2 image

I've read that with qemu-nbd and the network block device kernel module, I can mount a qcow2 image. I haven't seen any tutorials on mounting a qcow2 via a loop device. Is it possible? If not, why? I ...
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1answer
35 views

Loop device support on self compiled kernel doesn't work

I compiled 3.10 kernel, I checked that these configuration lines are not commented CONFIG_BLK_DEV_LOOP=y CONFIG_BLK_DEV_LOOP_MIN_COUNT=8 When i'm trying to mount loop device I get this error # ...
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19 views

Loop through directory and sum value next to specific pattern producing an average

I want to loop through all the files in the directory. the files are set out like this: <Overall>4 other data <Overall>2 other data ...... I have the code: for file in .dat; do awk '...
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1answer
35 views

Bourne Shell do while loop returns all the data but has two errors no such file or directory and repeats the shell name

The idea of my loop is to print the first digit of every line of a file. The file being this: 256-56-8411 Bob 3.61 Junior CS 471-44-7458 Tim 3.45 Senior CE 326-...
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1answer
41 views

Compare a certain lines from multiple documents

I want to compare a certain lines in a multiple documents. I tried using diff and comm, but the conditions are these, the documents are in a different working directory/folder, I could use a ...
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1answer
164 views

Using Device mapper thin provisioning on loop devices

I have several KVM raw files that are read only (about 100gb). I am adding these raw files as loopback devices. I then create a snap file to allow the VM to have read/write access to its disk. This ...
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4answers
370 views

How do you create a for loop with a changeable number of iterations?

How do you iterate through a loop n amount of times when n is specified by the user at the beginning? I have written a shell script and need to repeat a certain part of it n numbers of times (...
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2answers
119 views

cryptsetup: Attaching loopback device failed

I am using cryptsetup with detached header. For that I am using the --header parameter, to specify header file. I can open my device using: cryptsetup luksOpen /dev/sdb1 sdb1 --header LUKS-HEADER ...
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0answers
140 views

Creating a sparse (automatically expanding and contracting) swap file with hole-punching support

I have this crazy idea, and want to know the pitfalls of such an approach (or whether it can even work with no deadlocks.. etc). The goal is to create an automatically expanding and contracting ...
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1answer
251 views

Breaking out of while loop with a switch case inside

I am having an issue with exiting a bash script out of a while loop: while read -r dir event name; do case $event in OPEN) chown $VHOST:$VHOST $WEBPATH/$name; echo "The file \"$name\" ...
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0answers
107 views

Make whiptail work in a for loop

This is my first question ever here... So please be gentle :) I have a bash script that checks ping for 163 sites(stores around the country), which is this: #!/bin/bash #storestest.sh #version 0.9.2 ...
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1answer
59 views

Decrypting a previously create losetup device

I've created an encrypted backup in 2004, using losetup -e. I still know the passphrase, so I should be fine, but losetup is gone in the linux distributions I use. I still have a bash script for ...
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0answers
12 views

Is it safe to modify underlying file if it's mounted by losetup?

I've got a raw binary file and I need to access it (read-only) as a block device, for compatibility reasons. I mount this file through losetup eg. losetup /dev/loop0 file.bin. The block device is only ...
0
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1answer
15 views

Creating a function that reads off an input list of files

I am new to UNIX/Linux and am in the process of writing bioinformatics pipelines. These pipelines take in input files and pass them through multiple packages. Say there is a list of files that goes ...
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5answers
288 views

Looping through a file using a column

I am trying to loop through a file named file.txt that contains a bunch of junk and one column (column #4) I am interested in. I want this loop to run from 0 to eof. For each value in column 4, I want ...
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1answer
149 views

Bash For Loop - prompt for IP range and password

I have a simple for loop one liner I use to check for things across a number of servers that have the same password set. I want to develop this one liner into a script that logs into a cluster of ...
2
votes
1answer
40 views

combining output from different scripts into different files in a loop

First of all: I hope the question is comprehensible, otherwise please let me know and I will do my best to make it more clear. This is a follow up to Replace one entire column in one file with a ...
2
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2answers
51 views

bash: how to add assigned value to file

I have bash script looping through several files in a directory. The file identifier has been saved as a variable $num. What I would like to do is add $num as another column in my data like in the ...
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1answer
56 views

Get target device by /dev/dm-X entry

I have to map several loopback devices via dmsetup. I could track which loopback device is mapped to a particular /dev/dm-X device file, but is there an easy way to get this info by the /dev/dm-X ...
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0answers
182 views

Unable to mount secondary HDD on CentOS 6.7 (Must specify file system?)

I have a secondary HDD that worked fine in Ubuntu 13.04. I had mounted in to /media/user/<some UUID>/. I could read and write files without problem. My Ubuntu installation was on a primary SSD. ...
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81 views

How to copy/burn a loop device image to a partition?

I'm building a rootfs for a embedded device. I start by making an empty loopback file system, then mount it, and add files to it. When I finish, I end up with a file system image. Then I can burn ...
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1answer
251 views

What is the difference between loop device and block device? [closed]

I want to create a loop device myself, I want it to have a special name, say /dev/loop-test-0. I want it to be up after I reboot the machine. I though that I can use mknod for this, but this doesn't ...
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3answers
822 views

Bash script: do something one time inside a loop then stop, but continue looping

I have a Bash script that checks my laptop battery and sends me an Android notification (via shuttle, a Bash script I wrote that serves as a cli interface for the Pushbullet API). It works nicely, but ...
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2answers
496 views

breaking out of command loop but exit code not the reason?

I run the following: echo "while emacs;do echo $?;done;echo Exit code: $?;" | bash If I exit emacs through the menu or the close button, it prints exit code 0 and restarts. If I exit emacs through ...
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1answer
46 views

How can I loggin from VM1 to VM2 using script?

I am using script to loggin my VM2 from VM1 (Password of the VM2: fifa): for i in {a..z}{a..z}{a..z}{a..z} do # $i as a password ssh root@ipaddress read i echo $i done bit it doesn't work. ...
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1answer
74 views

How to troubleshoot disk controller on Illumos based systems?

I am using OmniOS which is based off of Illumos. I have a ZFS pool of two SSD's that are mirrored; the pool, known as data is reporting its %b as 100; below is iostat -xn: r/s w/s kr/s kw/s ...
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4answers
847 views

How to atomically allocate a loop device?

I am writing some shell scripts to handle some disk image stuff, and I need to use loop devices to access some disk images. However, I am not sure how to properly allocate a loop device without ...
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2answers
100 views

Variable in for loop to be used as an array for a csv output

I've been struggling to come up with a solution for this, the goal is to organize the results into comma separated columns as we have to recable our entire datacenter from cat6 to cat6a. $DBFILE ...
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2answers
373 views

How do users mount .bin/.cue or .iso with loopback device as read only?

Can users mount any of the following image files as read-only using a loopback device? If it is possible then can anyone give me examples?
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1answer
474 views

Installing Arch Linux on an SSD

I'm making my way through this: https://wiki.archlinux.org/index.php/Beginners%27_guide I've done this successfully a couple of times when working with conventional HDDs but I've recently bought and ...
1
vote
1answer
164 views

BASH: looping through ls [duplicate]

I'm having trouble with this piece of code: 22 for filename in "$( ls "$1" | grep ".*\.flac$" )"; do 23 file_path="$1${filename}" 24 ffmpeg -i "${file_path}" -f ...
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134 views

SED: print entire paragraph for specific pattern while loop

I find partial answer about my problem on this question but i still have trouble. I need to use a variable as a pattern for the sed command in a loop sed -e '/./{H;$!d;}' -e 'x;/'$var'/!d;' The ...
3
votes
2answers
791 views

Generating a .img from tarball: The /dev/loop devices

I'm trying to make a .img from a tarball using the following script I found: #!/bin/bash # Packages required # dosfstools parted # Can be run on any Linux system # loop.max_part=15 must be in ...
3
votes
3answers
251 views

Create Linux distro with minimal number of files

I'm thinking about designing a system for a project using some single-board computer (RaspberryPi, CubieTruck etc) that runs Linux. My main requirement is keeping the complexity of the booted SD card ...
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4answers
2k views

Executing a command within `if` statement and on success perform further steps

I was trying to execute a program which will create a directory on the basis of a complete path provided to it from the prompt and, if the directory already exists it will return an error (for "...
3
votes
2answers
442 views

How to find which images belong to which /dev/loop?

I work a lot with imaged drives, meaning a do a dd-copy of the drive in question and then work on the image instead of the drive itself. For most work, I use kpartx to map the drive's partitions to a ...
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0answers
266 views

Loopback (bind) mount automatically mounting additional ext4 USB drive

I have a USB (ext4) drive connected and it's registered in /etc/fstab. It mounts at /media/Backup fine. I want to mount a specific directory on that drive using a bind / loopback mount (this is ...