Hello World (bash)

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Hello world in the GNU Bourne-again Shell (bash):

• The first line tells the operating system how to execute this script;
• "echo" is a built-in shell command, that writes all arguments to standard output.

<<hello_world.sh>>=
#!/usr/bin/env bash

echo "Hello World!"

This is essentially the same program as Hello World (sh), but invokes a different shell. For a simple program like this, it makes little difference which shell is actually used. However, bash offers a number of features not found in the standard Bourne-shell which are useful for developing more complex scripts.

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