I made a bash script. It reads a file contains a list of commands and runs each of them. A list of commands is like below. Each line has a environment variable before command to set same name but different value to commands. A script is like below. I expect: run command1 with ENV_NUMBER=1 run command2 with EN…
Using linux find command to identify files that (A) match either of two names (with wildcards) and (B) that also contain a string
The find command is really useful to identify files with a given name that also contain a string somewhere inside of them. For instance lets say I’m looking for the string “pacf(” in an R markdown file somewhere in my current directory. I get useful results. However, sometimes, I’m not…
Fast byte copy C++11
I need to convert C# app which uses extensively bytes manipulation. An example: Basically BitConverter and Buffer.BlockCopy called 100s times per sec. There are several classes that inherit from the base class above doing more specific tasks. For example: What approach in C++ should I look into? Answer Best o…
Error CrushLoopBackOff to start k8s Dashboard
I try to install dashboard to clear private k8s cluster (without internet connection). I did according to this instruction https://github.com/kubernetes/dashboard. When start apply recomended.yaml: metrics scrapper start successfully, but dashboard show error CrashLoopBackOff permanently. Docker Version: 19.0…
Can’t compile to .wasm on Linux
Summary (Edit: removed all unnecessary information, added Windows10 experience, upgraded CLANG on Ubuntu to the same version, removed Debian10 due to old CLANG version) I’ve created a pretty simple WASM module, compiled on MacOS, works ✅, compiled on MS-Windows10, works ✅, compiled on Ubuntu21.10: produ…
About memory allocation, does C malloc/calloc depends on Linux mmap/malloc or the opposite?
As far as I know, C has the following functions, e.g: malloc, calloc, realloc, to allocate memory. And the linux kernel also has the following functions, e.g: malloc, mmap, kmalloc, vmalloc… to allocate memory. I want to know which is the lowest function. If you say, “Linux kernel is the lowest fu…
sqlplus query + loop on linux
I have pratically 0 experience on unix and few on mysql and I am finding hard where to start to complete this task, I have to write a .sh file to launch once a day. I have a table on OracleDb where I have 2 columns I need: path and file_name. Once I get the results, I should loop through
How to introduce an input in a C program through shell script?
When I execute the program in console I just do this: and it just print a integer. The thing here is that I want to introduce 1000 textfiles as input so I made this script: The trouble here is that the script is not putting the output in the file text because is not iterating as it should, I think
System.Drawing High memory usage on Linux
Is there any way to diagnose Unmanaged memory leak ? I am using .NET 5.0 Console App with NETCode (barcode) library. The program it self is simple it calls barcode library & creates a base64string from Image 5000 times, I am using ‘using blocks’ therefore disposing is also being handled. On wi…
How to troubleshoot Vscode ssh could not establish connection to “hostname”?
I’m trying to connect to a host with Vscode ssh, but I keep getting “could not establish connection to ‘hostname’”. I’m confused because it was working perfectly fine and then it stopped working out of the blue. I did not change the hostname or any config related to ssh in vscode…