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Every Android device comes with a born-shell and some commands. Some commands are built-in into shell. On you devices you can add additional shells and commands.

Built-in commands

Every shell has a few built-in commands. Some common built-in commands are:
- echo -- display a line of text.
- set -- set or unset values of shell options and positional parameters.
- export -- set export attribute for shell variables.
- cd -- change the shell working directory.
- pwd -- print name of current/working directory.

Environment variable PATH

The shell will run any command(program) found in PATH. The PATH is a colon (':') separated list of directories.
You can find out your shell's PATH by using the built-in echo command:

$ echo $PATH