What is UNIX Commands
§ A
command is a program which interacts with the kernel to provide the environment
and perform the functions called for by the user.
§ A
command can be: a built-in shell command; an executable shell file, known as a
shell script; or a source compiled, object code file.
§ The
shell is a command line interpreter. The user interacts with the kernel through
the shell. You can write ASCII (text) scripts to be acted upon by a shell.
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