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

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Friday 07 January 2005 08:22, Mandeep Sandhu wrote:
> a simple "man" on the shell wud cause the shell to fork a new
> process...cal exec to load "man's" code into the addr. space to
> start execution and "wait" (not sure of this!) for this child (i.e
> man here) to finish....right? does the shell handle calling "exec"
> from the prompt differently?!?

$ man

The shell will do a fork() and the child will do an exec(man).
The parent will wait for the child to finish

$ exec man

The shell will do an exec(man) -- the shell is gone.

$ exec man &

The shell will run "exec man" in the background.
It will call fork() but not wait.
The child will exec(man).
This is not much different from just "man &"



--
Kernelnewbies: Help each other learn about the Linux kernel.
Archive:       http://mail.nl.linux.org/kernelnewbies/
FAQ:           http://kernelnewbies.org/faq/


[Index of Archives]     [Newbies FAQ]     [Linux Kernel Mentors]     [Linux Kernel Development]     [IETF Annouce]     [Git]     [Networking]     [Security]     [Bugtraq]     [Yosemite]     [MIPS Linux]     [ARM Linux]     [Linux RAID]     [Linux SCSI]     [Linux ACPI]
  Powered by Linux