Useful tips for everyday
How do you compare SD? Comparison of variances: if you want to compare two known variances, first calculate the standard deviations, by taking the square…
What is a P norm? For p∈ℝ, p≥1, the p-norm is a norm on suitable real vector spaces given by the pth root of the…
Why does vi Open vim? It stands for vi improved. How it works: vim looks for a config file at ~/. vimrc , if this…
What does 3 with a little 2 mean? An exponent refers to the number of times a number is multiplied by itself. For example, 2…
How do I check the connection between two Linux machines? For checking server connectivity you have 4 tools at your disposal. ping. This will check…
Can a process be both a client and a server? Yes, absolutely. You can do it with multiple threads, or with just a single thread…
Is hub and spoke the same as star topology? It is the same as a star topology in a network. A network hub is hardware…
What is the weight of a binary number? The binary weight of a positive integer is the number of 1’s in its binary representation. For…
Is Firebird a good database? Firebird is a relational and open source database that provides many SQL and ANSI features that are able to perform…
How do you grep the last occurrence? 6 Answers Print last occurence of x (regex): grep x file | tail -1. Alternatively: tac file |…