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I recently made the following (i believe important) changes to my system
Actually I was following this tutorial to use something called Linux Containers.
So can you tell me if any of the following stuff is capable enough to crash my system ?
1. Making changes to /etc/fstab or
2. mount /cgroup which will try to mount cgroups automatically or
3 making changes to etc/network/interfaces or
4 making changes to /etc/resolv.conf
A typo in fstab can definitely make a system un-bootable. However, you should be able to boot from CD, mount the HD, and fix it.
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I need to fix the microphone volume for any user in Ubuntu 16. What I want is to fix the volume, say, to %40, and keep it at that value for all times. It must be changed by no user except root. How can I do such a config? And with what tool?
Thanks.
All mixer controls of a card are managed with a single device node (/dev/snd/controlCx), so it is not possible to use file permissions for this.
However, you could program a separate tool that calls
snd_ctl_elem_lock() for the mixer control that no other program should
be able to change.
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Closed 7 years ago.
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Most likely a rather obvious question but nevertheless I am doubtful about it. For development purpose our team got an linux VM tot work on. Once in a while I met a lost+found directory. Most of the time it is not accessible (permission denied). What is the meaning of this directory. Has it been implemented by Linux or has it been manually by one of the administrators?
I do agree with #Arcturus-B and I put some effort in it to get some extra informatie. I found info at https://unix.stackexchange.com/questions/18154/what-is-the-purpose-of-the-lostfound-folder-in-linux-and-unix and http://www.linuxnix.com/2012/12/lostfound-directory-linuxunix.html I guess I was a little bit cautious and did expect to find so much detailed information about this.
Files that are being open when an unexpected shutdown occurs may be damaged. On the following power up, the fsck tool is run to try to recover them. If any file is to be recovered, it is placed in the lost+found directory of the partition the original was stored in.
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Actually I am just trying to build up a cluster(beowulf) in which there is a modification required in /sbin/lilo for reflecting the access to master node by slave node after it goes up . I changed the /etc/lilo.conf.anaconda file for timeout=1200 , but unable to find the /sbin/lilo file to get result of added linux.Please help me that where do i verify that the modificaion is been implemented??....I am working on RHEL 4.
lilo was the boot loader of Linux a long time ago.
As far as I can tell, all distributions have moved to using grub as default instead, as it is much more robust. With lilo, the risk of ending up with a non-booting system were much higher.
It seems you are following an extremely outdated manual?
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Closed 9 years ago.
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I would like to execute "lessc ~/less/app.less > ~/stylesheets/styles.css" everytime I modify a .less file on my machine. Is it possible ?
If you are looking for a generic approach, Linux kernel has a feature called inotify that monitors file system changes.
You will have to write a small program to make use of the interface. inotify has bindings for all major languages, including perl and python .
Take a look at incron, a crontab-like system for inotify. You can set up rules to trigger any commands you want, based on events in the filesystem.
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I am using Cent-OS and I am trying to copy a file. I su to root first, then I execute:
cp test.txt /usr/java/jdk1.7.0_45/jre/lib/management
But I get an input/output error. Why can't I copy this file as root? Is there something that can lock a folder in Linux so root can't change it?
root is a concept to get around the system's permissions.
IO error is a more physical problem that could be of a much more varied nature. Common examples included faulty media, unreadable CDs, lost connection, and so on.