Technology

Difference between Bash and Dash

Main difference

Dash is a shell that has little usability for modern needs when used as an interactive login shell, however it is faster at executing POSIX-compliant scripts than Bash. Bash has many more options and is especially preferable when used interactively (although it includes more programming options as well). Bash is normally equipped as a result of the default interactive shell, while Debian and Debian derivatives like current Ubuntu Dash as a result of the /bin/sh implementation, which inflicts scripts with #! /bin/sh shebangs to be interpreted by Dash just as Bash does by default. For scripts that require Bash to run, Bash will nonetheless be used as the result of the interpreter if the shebang is #! /bin/ bash.

What is Bash?

Bash is the additional shell of Bourne-Eleven. Bash is an excellent full-featured shell acceptable for interactive use; it is definitely the default login shell though. Bash is designed for humans and provides a superset of POSIX efficiency.

What is Dash?

Dash is the Debian Almquist Shell. Dash implements the Single Unix Specification, so it shouldn’t do more to satisfy that formal specification. Dash is for non-interactive script execution. Dash Only helps POSIX-compliant options.

Key differences

  1. Bash is an excellent full-featured shell acceptable for interactive use; it is definitely the default login shell though. However, it is hardly large and slow to start and operate by comparability with the board.
  2. Dash implements the Single Unix Specification, so it shouldn’t do more to satisfy that formal specification. But among the many “bashiisms” they are useful, they would add little to the size of the board and make using the board much less complicated instead.
  3. A bunch of shell scripts spanning the set of commands, well, they shouldn’t be compatible with dash, but bash.
  4. Bash Supports Dash-equivalent scripting statements along with their additional private addresses, Dash Only supports POSIX-compliant options.
  5. Bash is designed for humans and provides a superset of POSIX efficiency, Dash is for non-interactive script execution.
  6. Bash helps tab completion and supports a previous history command.
  7. Dash is just 100Okay compared to Bash’s 900Okay.
  8. Dash is for faster startup and script execution compared to Bash.

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