These code snippets demonstrate how to access command line arguments for a Node.js program.
This example shows how to get information from the user using Standard Input (STDIN), which is typically the keyboard.
Standard in and Standard out (STDIN/STDOUT) are very common methods of interacting with the user. Standard in is typically the keyboard and standard out is the terminal. Haskell makes this very easy to access. The getLine function gets a value from the user and putStrLn and putStr allow you to write to output. The ++ operator is used to concatenate strings.
In Haskell, you can access the command line arguments with getArgs. Check out this example.
Tcl programs can accept command line arguments to pass runtime variables. These code examples show how to make use of these arguments.
In PHP, all command line arguments, including the script name itself are stored in a special array named $argv. The first element, zero, is the name of the script being run. For example:
The shell is a powerful tool that I think most people underestimate and under-utilize. Bash is probably the most common in the community, so we will refer to bash in all the examples, but all shells should support the same concept of redirection and piping. Below are some things to keep in mind when writing a program that is intended to run on the command line and play well with the shell.