line-numbers

I want to delete one or more specific line numbers from a file. How would I do this using sed? Brian Campbell If you want to delete lines 5 through 10 and 12: sed -e '5,10d;12d' file This will print the results to the screen. If you want to save the results to the same file: sed -i.bak -e '5,10d;12d' file This will back the file up to file.bak , and delete the given lines. Note: Line numbers start at 1. The first line of the file is 1, not 0. You can delete a particular single line with its line number by sed -i '33d' file This will delete the line on 33 line number and save the updated file.

In the sake of debugging purposes, can I get the line number in C /C++ compilers? (standard way or specific ways for certain compilers) e.g if(!Logical) printf("Not logical value at line number %d \n",LineNumber); // How to get LineNumber without writing it by my hand?(dynamic compilation) You should use the preprocessor macro __LINE__ and __FILE__ . They are predefined macros and part of the C/C++ standard. During preprocessing, they are replaced respectively by a constant string holding an integer representing the current line number and by the current file name. Others preprocessor

Here is an example of what I want to do: MessageBox.Show("Error line number "+CurrentLineNumber); Current line number will be the line number in the source code of this piece of code. How can I do that? In .NET 4.5 / C# 5, you can get the compiler to do this work for you, by writing a utility method that uses the new caller attributes: static void SomeMethodSomewhere() { ShowMessage("Boo"); } ... static void ShowMessage(string message, [CallerLineNumber] int lineNumber = 0, [CallerMemberName] string caller = null) { MessageBox.Show(message + " at line " + lineNumber + " (" + caller + ")"); }