argv1

argv1 is a term used to refer to the first command-line argument passed to a program, excluding the program name. In many languages, the arguments provided by the user are collected in an array or list, and argv1 denotes the element at index 1 of that collection in languages with C-style indexing.

In C and C++, command-line arguments are typically accessed via main with a signature such as int main(int argc, char *argv[]). argc is the argument count, and argv is an array of pointers to null-terminated strings. argv[0] usually contains the program path or name, and argv[1] is the first user-supplied argument. If argc <= 1, there is no argv[1]. It is common to check argc > 1 before using argv[1], and to interpret the string according to the program’s syntax. Notably, argv[argc] is guaranteed to be a null pointer.

Other languages use similar concepts with different conventions. In Java, the first user argument is args[0] inside the main method, since there is no implicit program name in the array. In Python, sys.argv[0] is the script name and sys.argv[1] is the first argument if present. In Node.js, process.argv usually starts with the node executable and script path, so the first user argument is process.argv[2]. Across languages, argv1 serves as a reference to the first value supplied on the command line, requiring careful validation and proper parsing.