Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 2 years ago. Improve this question I have a username.txt which contains their username and specific group. As…
Why am I not able to view the clone() system call in strace output when typing ‘strace ls’ in terminal?
My understanding is that when we type ls in the terminal: It invokes fork() library function which invokes system call clone() to create a child process. Then system call execve() is invoked to replace address space of the new process created with new content. In that case I was expecting to see system calls …
Search for log having value greater than certain time
Below is the sample log: Below is the desired output: When I use awk if it is exact time it will display the output otherwise it not displaying the output. Below is the code: Not displaying output: Displaying output: Besides that I got to find a solution. Below works but not as expected. Displaying output as …
Is there a way to run iBeacon on Bluetooth 2.0 compat. device?
So I have a Linux with old BT2.0. I want to use it as iBeacon. Energy consumption is not my concern; the only one is API. Is it possible? Answer Unfortunately no. iBeacon and beacons in general depend on BLE advertisements, and this was introduced as part of the Bluetooth Low Energy features that are part of …
Adding prefix of directory name to all rows of a column in Bash
I want to add a prefix of a folder’s name to all rows of a csv file. The aim is to combine this awk command with the find command so I can automate it and apply it to all directories and subdirectories within a folder. Trying to output the result to a new csv file _prefix.csv to be safe. What
Extracting month from day using linux terminal [closed]
Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 2 years ago. Improve this question I am having a text file containing a list of date and time just like the s…
How can I determine the precise set of environment variables a systemd EnvironmentFile would set?
systemd has an EnvironmentFile directive, which sets environment variables from a file’s contents based on a number of rules, which are not quite equivalent to how a shell would parse that file. How can I parse a systemd EnvironmentFile in exactly the same way that systemd itself would? Answer The sures…
AWK: Comparing substrings from two files and write to third file
I’m trying to compare two different files, let’s say “file1” and “file2”, in this way. If the substring of characters i.e 5 characters at position (8 to 12) matches in both files – file1 and file2, then remove that matching row from file 1. Finally, write the output t…
Accessing physical address space using mmap in Linux: passing the correct arguments to mmap
I need to access and write to some physical addresses in my RAM. I was looking at this answer and the definition of mmap. If addr is NULL, then the kernel chooses the (page-aligned) address at which to create the mapping; this is the most portable method of creating a new mapping. If addr is not NULL, then th…
implementing Excel if-like function with AWK
I have a question about Excel-if-function implementation with AWK. I have a csv file having eight columns like below: Each field can take only integer values from 1 to 6. I would like to give one point if the first column is 1. In other cases, the score would be zero. In this MWE case, the point for all three