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Re: how is "exec" executed by a shell?

Mandeep Sandhu wrote: 
But does'nt the shell "wait" for whatever command is given to it
to complete???....little confused here.

It does. Running "man" with no parameters causes a single line of text to be printed, and man exits immediately after. As the shell has been replaced by man, and man exits instantly, then you lose your shell.

$ exec exit
bash: exec: exit: not found

did not work! is'nt "exit" also a command? 

$ type exit
exit is a shell builtin

Daniel

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