7. Types of Commands
Contents
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:
there are five types
Alias
Alias is a shortcut to commands, such as ll is a simplified version of ls-alF:
the simplified version of ls -alF
Keyword
Shell has some reserved keywords, while is one of them:
these are system defined functions
Function
We can use the declare -F command to get the defined functions.
it is a shell reversed keyword
From the results of the command execution above, we know that quote is a function:
it is a shell reversed keyword
We can also use declare’s synonym to get the function, which is typeset:
these are system defined functions
Builtin
The declare command we use is built into Bash:
it is a bash shell builtin command
File
Some of the commonly used file type commands are mkdir, cp, mv, touch, rm:
commonly used file type commands
We can append the -t parameter behind the type command to get the commands types:
list types by appending the -t parameter
References Type Manual, Alias Command Shell Reserved Words, Shell Functions, Shell Builtin Commands, File Command
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Author Dong Chen
LastMod Fri Feb 8 2019