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How do I fetch lines beforeafter the grep result in bash

I want a way to search in a given text For that I use grep grep i myregex That works But given the data like this This is the test data This is the error data

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How do I git diff on a certain directory

git diff actually runs a diff on all source code How do I do this on a certain directory so that I can view modifications on files underneath

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How do I retrieve the number of columns in a Pandas data frame

How do you programmatically retrieve the number of columns in a pandas dataframe I was hoping for something like

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How do you do relative time in Rails

Im writing a Rails application but cant seem to find how to do relative time ie if given a certain Time class it can calculate 30 seconds ago or 2 days ago or

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How does one Display a Hyperlink in React Native App

How do I display a hyperlink in a React Native app eg lta

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How is Nodejs inherently faster when it still relies on Threads internally

I just watched the following video Introduction to Nodejs and still dont understand how you get the speed benefits Mainly at one point Ryan Dahl Nodejs creator

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How should I copy Strings in Java

String s hello String backupofs s s bye At this point the backup variable still contains the original value hello this is because of Strings immutability right

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How to add column if not exists on PostgreSQL

Question is simple How to add column x to table y but only when x column doesnt exist I found only solution here how to check if column exists SELECT

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How to calculate the time interval between two time strings

I have two times a start and a stop time in the format of 103326 HHMMSS I need the difference between the two times Ive been looking through documentation for

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