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NOTE: You can add an -x to the interpreter line of bash scripts to assist with debugging. This will echo the expanded variables and actual runtime code in addition to the more common output vectors like the echo command. For example, #!/bin/bash x. Using this syntax, you can also specify atypical shell interpreters, such as Perl (#!/usr/bin/perl), Python (#!/usr/bin/python), or Ruby (#!/usr/bin/ruby), the list goes on. For the most part, OS X, and most *nix variants all utilize the same directory to store interactive user shells in: the /bin/ folder. This folder is defined by BSD as housing: user utilities fundamental to both single-user and multi-user environments. This folder is very common among the *nix variants, and can usually be trusted to contain at least the Bourne shell (sh), and on most modern systems, the bash shell. However, non-shell interpreters, such as Python, Perl, or Ruby are going to vary greatly from OS to OS. Because of this, if we want our shell to be portable (which these languages provide), then providing a static path is not going to provide much utility on nonconforming systems. If portability is your goal (and certainly it s never a bad one), you may want to forgo specifying an absolute path and instead let the parent shell dynamically determine its location. To do this, utilize the following hash-bang specifier:

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The key thing to know here, is that /usr/bin/env is a very commonly supported binary, and will cause the shell to search through its $PATH to locate the Python executable. If that s found in our path, this executable will be used as the interpreter for the script. The $PATH variable is an environmental variable used by nearly all shells and specifies a number of directories that should be consulted when searching for a binary. This variable contains a colon-delimited string of directories, and will search through them in order of preference from left to right. For instance, if I run the command echo $PATH, I will see all of the directories in my path:

Note: BlackBerry Desktop Software is not specifically a tool for developers. Every BlackBerry user can install it, and most do. It is included in this setup process because the Desktop Manager offers one of the easiest ways to install apps onto your device, either for debugging or to deploy.

Thus, if I were to run the command ifconfig, my shell would first look for the binary ifconfig in the /usr/bin folder, then in /bin, /usr/sbin, and so on until it ultimately finds the command (in this case, in the /sbin directory). If the command is not found after searching the entire path, the shell will terminate execution of the script with an error. On top of this, the PATH variable becomes a good way for a user to inject his