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Closed 5 years ago.
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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 3 years ago.
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One of the data elements produced by the finger command gives information on how long a logged in session has been idle. Where does finger get that information from on RedHat? I've looked in /proc/<pid>/ but did not find anything useful, and the documentation doesn't go into the commands implementation.
So, where in the system is finger (or w) pulling this information from?
The finger program get's this information from utmp file located at /var/run/utmp.
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Closed 6 years ago.
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I am making a folder where there are some shared files which can be read and written by anyone (but not executable) in a server. But I don't know what kind of owner and group are used for the files. Are there any special or well known owner or group for the purpose? Thank you very much.
The best approach to do this would be to use:
chmod 110
This will change file permission to read & write, no execute
linuxcommand.org/lts0070
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Closed 9 years ago.
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I would like to have more clarification on the functionality of sync(8) and fsync functions in Linux (2.6.31). Does it make sure the files are written to the respective storage?
http://linux.die.net/man/8/sync
It does not make sure that files are written to respective storage. It only makes sure that cached/buffered data is flushed to the disk device. It doesn't matter if this is an SD Card or whatever.
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Closed 8 years ago.
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In linux, Is there a way I can save my long/complex passwords I have to type like hundreds times daily basis somewhere and create a hot key against them so that every time i want to input the password, I can just use the hot key?
Use some sort of password manager like kwallet, i personally use keepass on windows. Pressing ctrl+alt+a autotypes passwords.
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Closed 8 years ago.
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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.