Top new questions this week:

redirect sound (microphone) via ssh, how to telephone via ssh?

How can I redirect the microphone of one computer to listen to it on another computer via ssh? Which is the right device or which is the right command line? Some years ago it was easy and fun to …

/ ssh / audio / redirect

asked by erik 25 votes answered by erik 30 votes

What is maximum RAM supportable by Linux?

What is the maximum supportable RAM by Linux? Assume that hardware is/supports 64-bit. Among all Linux distros. Does it go up to 16 exabytes, or is it limited like with Windows which I believe is 192 …

/ linux / memory

asked by Rik Telner 16 votes answered by slm 14 votes

^x^y unix trick for all instances in last command?

One of my favorite Unix tricks is ^x^y, which will take the last command and replace the first instance of "x" with "y". However, I'm wondering if a similar trick works to replace all instances of "x" …

/ bash / command-line / command-history

asked by Mason 16 votes answered by slm 20 votes

How do keyboard input and text output work?

Suppose I press the A key in a text editor and this inserts the character a in the document and displays it on the screen. I know the editor application isn't directly communicating with the hardware …

/ x11 / keyboard / architecture / display

asked by Gilles 13 votes answered by Gilles 18 votes

Subtract 1 from all file names (rename them) in a directory.

I have a directory which contains image files with names like image1.jpg image2.jpg image3.jpg ... Unfortunately, the image names must be zero based, so image1.jpg should be image0.jpg, …

/ command-line / rename

asked by Wes 12 votes answered by bersch 13 votes

Diagram of Linux kernel vs. performance tools?

Is there a diagram that shows how the various performance tools such as ip, netstat, perf, top, ps, etc. interact with the various subsystems within the Linux kernel?

/ linux / performance

asked by slm 10 votes answered by slm 14 votes

Can root/superuser read my read-protected files?

On shared unix hosting, if I have a file sensitive-data.txt and I issue: chmod 600 sensitive-data.txt Can root user still read my file? Specifically I'm wondering if it's safe to store my password …

/ permissions / security / root

asked by User 10 votes answered by terdon 30 votes

Greatest hits from previous weeks:

How can I fix "cannot find a valid baseurl for repo" errors on CentOS?

I finished installing CentOS 6, but when I tried running yum update I got: [root@centos6test ~]# yum update Loaded plugins: fastestmirror, refresh-packagekit Determining fastest mirrors Could not …

/ centos

asked by user1002795 5 votes answered by Jorge 4 votes

How to add a newline to the end of a file?

Using version control systems I get annoyed at the noise when the diff says No newline at end of file. So I was wondering: How to add a newline at the end of a file to get rid off those messages?

/ bash / shell / text-processing / newlines

asked by k0pernikus 33 votes answered by l0b0 41 votes

Can you answer these?

How is a username determined and can I hide the domain component in a winbind username?

Someone asked a question on Server Fault about a problem which I'm also having but no one has answered it so I'm posing a slightly different question to try and figure it out myself. I've configured …

/ users / samba / kerberos / nsswitch / winbind

asked by Styne666 1 vote

How to remove "dead window parts" after GUI errors?

I have experienced this problem with Chrome only (but for quite a while now, different versions) but the question is not about Chrome but about X (I guess). Sometimes (I am not aware of any pattern) …

/ xorg / x11 / chrome

asked by Hauke Laging 2 votes

Using FACLs to restrict default group but allow others

So, I'm running RHEL 6.x with acls enabled, etc. and I've been fighting this ACL issue for a bit now and I can't seem to get it down. I'm trying to make it so that: /var/www/html/* are owned …

/ permissions / rhel / apache / acl

asked by user61552 2 votes