I’m not completely sure if I should ask here, over at the Unix forums or somewhere completely different but, here we go. I’m using Packer to create a set of images (running Debian 8) for AWS and GCE, and during this process I want to install HAProxy and set up a config file for it. The image build…
Is it possible to set timer with local time in Linux?
I’m on my IOT project with raspberry pi, And I want to raise event in certain time like 06:00:00 and 12:00:00 But I can’t do this with jiffies because jiffies only counts the time since the os started. I have an Idea : I may raise interrupt every second and check local time, compare it with certai…
How to access website on a Linux server in Azure? [closed]
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. This question does not appear to be about a specific programming problem, a software algorithm, or software tools primarily used by programmers. If you believe the question would be on-topic on another Stack …
How to get CPU Utilization number from top?
How would I get the number for CPU Utilization from running the top command on a specific user? Answer Pipe top to awk and add up the CPU utilization column: That awk command says “For rows (from top) greater than row 7, add up the number in field 9 $9 and store it in variable sum. Once you have gone
Negative lookbehind assertion regex has unexpected result with grep -P
I’m testing the following negated lookbehind assertion and I want to understand the result: it prints out I was expecting that only the two first foo would be printed, ‘echo foo foofoo’ but not the third one, because my assertion is supposed to mean find ‘foo’ that is not precede…
Each process has its own kernel stack, right?
I saw some SO questions come with a conclusion: Each process has its own kernel stack. But how about this code? Or how about this one? Whether does this program also have a corresponding kernel stack? More: For the 1st code above, I tested it like below. Press Ctrl+C to stop it, and see that system time is le…
Why does octal dump output the ascii code for an integer variable instead of the binary code?
This is the code in C to input a character and integer variable to a file. So lets say the file name is text and the od command is invoked.. This is the output of the command Why does it print the ASCII values for both of the value 40 and not the hex code 0028 for the integer variable?
How does dynamic linker changes text segment of process?
If i understand correctly when user tries to execute dynamically linked executable (with execve(“foo”, “”, “”)) instead of loading text segment of “foo” dynamic linker is loaded (ld-linux.so.2) and executed. It have to load libraries required for program (“…
sysfs_create_group(): Where to call?
currently i write an driver module which offers some entries in the sysfs. I read a lot through the driver source tree and the internet. I found two approches where the sysfs_create_group() is called: a) most commonly: In the probe() function of the Driver. Like adviced here How to attach file operations to s…
Finding the number of xml files having a particular word in a directory
I read Chris Maes answer on how to a grep for a particular word in any file/files contained in a directory, and it worked. But, what is the way of finding the names of the files and the total number of files containing that word ? Please correct me if I am wrong. Thanks in advance !! Answer You just