Answer / shaili

External- It is a compiled executable of a program.Shell
executes it.

Internal- Built in shell.Faster in execution.

Internal commands provides more flexibility and better
management. But, if all commands are internal, shell will
become larger and less responsive.

Answer / ankur

Internal command are built in commands in shell & shell
shell doesn't start a separate process to run internal
commands where as external command require the shell to
fork and exec a process which may take some time on a busy
system

Answer / niranjan

Ankur ur right... internal commands dont invoke a child process to excute the command. and there by faster execution.

Where as external commands forked as child process...

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