Linux Shells by Example

B.2. bash versus sh

The Bourne Again (bash) shell has the following features not found in the traditional Bourne shell (sh).

1. Formatting the prompts

2. History (csh style)

3. Aliases

4. A built-in command line editor (emacs or vi) for editing the command line

5. Directory manipulation with pushd and popd

6. Csh type job control to stop or run jobs in the background, bring them to the foreground, etc. with command such as bg, fg, Ctrl-Z, etc.

7. Tilde, brace, and parameter expansion

8. Key bindings to customize key sequences

9. Advanced pattern matching

10. Arrays

11. The select loop (from Korn shell)

12. Many new built-in commands

Feature	csh/tcsh	Bourne	Bash	Korn
Variables:
Assigning values to local variables	set x = 5	x=5	x=5	x=5
Assigning variable attributes	declare or typeset	typeset
Assigning values ...