Define internal and external commands.

Define internal and external commands.
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Answer :

Internal Commands: Commands which are built into the shell. For all the shell built-in commands, execution of the same is fast in the sense that the shell doesn’t have to search the given path for them in the PATH variable and also no process needs to be spawned for executing it. Examples: source, cd, fg etc.

External Commands: Commands which aren’t built into the shell. When an external command has to be executed, the shell looks for its path given in PATH variable and also a new process has to be spawned and the command gets executed. They are usually located in /bin or /usr/bin. For example, when you execute the “cat” command, which usually is at /usr/bin, the executable /usr/bin/cat gets executed.

Examples: ls, cat etc. 
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