How do I list all commands in Linux?

There are a few different ways to list all available commands in Linux:

Using the bash built-in help command: You can use the help command to list all of the built-in commands that are available in the bash shell. To do this, simply enter help at the command prompt.

Using the bash built-in compgen command: You can use the compgen command to list all of the available commands, including both built-in commands and external commands that are located in directories that are included in your PATH environment variable. To do this, enter compgen -c at the command prompt.

Using the bash built-in alias command: You can use the alias command to list all of the aliases that are defined in your current shell. Aliases are short names that are defined as substitutes for longer commands or command sequences. To list all defined aliases, enter alias at the command prompt.

Using the bash built-in type command: You can use the type command to determine the type of a given command. For example, you can use type ls to determine whether the ls command is a built-in command or an external command that is located in a directory that is included in your PATH environment variable. To list all available commands, you can use type with a wildcard, such as type *.

Using the bash built-in which command: You can use the which command to determine the location of an external command on your system. For example, you can use which ls to determine the path to the ls command. To list all available external commands, you can use which with a wildcard, such as which *.

Using the ls command: You can use the ls command to list the files and directories in a given directory. If you run ls with no arguments, it will list the files and directories in the current directory. You can use the ls command to list the files and directories in directories that are included in your PATH environment variable, which will include many of the external commands that are available on your system. For example, you can use ls /usr/bin to list the files and directories in the /usr/bin directory, which is typically included in the PATH environment variable.

Using the apropos command: You can use the apropos command to search the manual pages for a given keyword or phrase. The manual pages contain detailed information about many of the available commands on your system. For example, you can use apropos file to search for commands that are related to file management.

Overall, there are many different ways to list all available commands in Linux, and the method you choose will depend on your specific needs and goals.