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The is the command line shell. Commands can be issued via a terminal emulator.

Bash is an sh-compatible shell that incorporates useful features from the Korn shell (ksh) and C shell (csh). It is intended to conform to the IEEE POSIX P1003.2/ISO 9945.2 Shell and Tools standard. It offers functional improvements over sh for both programming and interactive use. In addition, most sh scripts can be run by Bash without modification.

How Puppy Loads Ash and Bash
Ash is a small inbuilt shell of Busybox.
Busybox is used when Puppy boots, it allows to keep the initial ramdisk small.
Busybox is a binary, that includes several commands, that else are only available as seperate programs.
But this small size has a price: not the full set of options of these programs are available.

So when Puppy booted, it additionally offers the bash, that is loaded from the big file pup_2xx.sfs.
Bash compatibility is required by several programs.

Also see

forum topic
forum topic
How to learn Bash commands
Bash Programming Cheat Sheet
Bash Tips

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