Appendix A
Quick Guide to bash Commands
In This Appendix
- The bash built-in commands
- The GNU additional shell commands
- The bash environment variables
As you've seen throughout this book, the bash shell contains lots of features and thus has lots of commands available. This appendix provides a concise guide to allow you to quickly look up a feature or command that you can use from the bash command line or from a bash shell script.
Built-in Commands
The bash shell includes many popular commands built into the shell. This provides for faster processing times when using these commands. Table A.1 shows the built-in commands available directly from the bash shell.
Table A.1 bash Built-in Commands
| Command | Description |
| alias | Define an alias for the specified command. |
| bg | Resume a job in background mode. |
| bind | Bind a keyboard sequence to a readline function or macro. |
| break | Exit from a for, while, select, or until loop. |
| builtin | Execute the specified shell built-in command. |
| cd | Change the current directory to the specified directory. |
| caller | Return the context of any active subroutine call. |
| command | Execute the specified command without the normal shell lookup. |
| compgen | Generate possible completion matches for the specified word. |
| complete | Display how the specified words would be completed. |
| continue | Resume the next iteration of a for, while, select, or until loop. |
| declare | Declare a variable or variable type. |
| dirs | Display a list of currently remembered directories. |
| disown | Remove ... |
