I tried to go through the numa_distance() and other related functions (From the 1st link ), But couldn’t understand. I am just trying to understand how linux calculates the NUMA distance between two nodes when this distance is said to vary based on architecture and NUMA interlink. I referred following l…
Getting 32 bit Centos docker image
I was trying to run 32 bit Centos in container: Inside container I run command uname-a in order to know it is 32 bit. Got output: According to my understanding it is 64 bit version and not expected 32 bit one? What I do wrong while getting 32 bit Centos? Answer Containers share kernel with the host system. Th…
How to capture the output of a top command (for a specific process that will die) in a file
I have a process MYPID=18686 that I am monitoring with top. When the process dies, the output file is empty. My end goal is just to record cpu usage over the lifetime of that process. Specifying -n 1000 -d 5 is a cheap workaround that runs top for the expected lifetime of the process. The tail -1 was to elimi…
Linux split a file in two columns
I have the following file that contains 2 columns : How is possible to split the file in 2 other files, each column in a file like this: File1 File2 Answer Perl 1-liner using (abusing) the fact that print goes to STDOUT, i.e. file descriptor 1, and warn goes to STDERR, i.e. file descriptor 2: You could, of co…
Are BIGNUM BN_ functions deprecated in openssl 1.1?
I was compiling some ‘C’ code that uses openssl under Fedora 27 (version 1.1.0g-1). I made some needed changes (from the 1.0.2 version of my code) and things now compile o.k. again. I then tried to compile with the option “OPENSSL_API_COMPAT=0x10100000L” which I understand causes the c…
Pcap4j Library: Exception in thread “main” java.io.IOException: No NIF to capture
When I capture packets, I get the following error: Exception in thread “main” java.io.IOException: No NIF to capture. The code is: But I run this code with sudo command, it is running. Why don’t I run this code without sudo? I should run this code without sudo. How can I run this code? Answe…
Does all linux users are present on /etc/passwd? [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 …
Nginx returns 404 not found when access file on server
I have a server(Ubuntu 16.04) and a user called coxier. I configure Nginx to Proxy Requests. I create a file etc/nginx/sites-available/myproject. In this flask project, server receive request and then generate a .gif file for this request. At first I directly I use flask#send_file to send gif file about 1MB, …
Run bash command from python and capture file object
in jupyter notebook I can run the following command and get a list of file objects that I can then open: I have tried the following: But I can only get a string object not file objects that I can then open and get data from. Answer Filenames are strings. That’s what you pass to open to get a file
How to grep for a matching word, not the surrounding line, with a wildcard?
Maybe an odd question, but I’m attempting to grep the output of a command to select just the matching word and not the line. This word also has a wildcard in it. The first and second sections of the command check the git log for a file and grabs the line pertaining to the date and time of creation. I…