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Full Discussion: exec command and field descriptors..
Top Forums UNIX for Dummies Questions & Answers exec command and field descriptors.. Post 58925 by moxxx68 on Saturday 4th of December 2004 04:14:36 PM
Old 12-04-2004
where does :
exec 3
exec 4
exec 5
come into the picture.. ?
so far I have understood the stdout and stderr
but i don't see how this the use of exec or the use of fd 3 can write to a file. or how fd 4 can read stndin and how fd 5 can stdout to tty.. i am not making the connection between the numbers and the exec command basically for 3 to 5.
 

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LEARN ABOUT SUNOS

setpgrp

setpgrp(1)							   User Commands							setpgrp(1)

NAME

       setpgrp - set process group ID

SYNOPSIS

       setpgrp command [arg...]

DESCRIPTION

       If the current process is not already a session leader, the setpgrp utility sets the process group ID and session ID to the current process
       ID and does an exec() of command and its argument(s), if any.

OPERANDS

       The following operands are supported:

       command	       The name of a command to be invoked.

       arg	       An option or argument to command.

EXIT STATUS

       The following exit values are returned:

       1	       Error executing the setpgrp utility or during exec() of command.

       Otherwise, the exit status will be that of command.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       exec(2), setpgrp(2), attributes(5)

SunOS 5.10							    5 Jan 2000								setpgrp(1)
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