Type is a command to view command types. We can look at what types this command can see with the help of the help command:

Alias

Alias is a shortcut to commands, such as ll is a simplified version of ls -l:

Keyword

Shell has some reserved keywords, while is one of them:

We can use the declare -F command to get the defined functions.

From the results of the command execution above, we know that quote is a function:

We can also use declare’s synonym to get the function, which is typeset:

The declare command we use is built into Bash:

Some of the commonly used file type commands are mkdir, cp, mv, touch, rm:

We can append the -t parameter behind the type command to get the commands types:

References Type Manual, Alias Command Shell Reserved Words, Shell Functions, Shell Builtin Commands, File Command