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Full Discussion: Difference between <stdin> & terminal
Top Forums UNIX for Advanced & Expert Users Difference between <stdin> & terminal Post 302124282 by Shell_Life on Friday 29th of June 2007 09:44:07 AM
Old 06-29-2007
<stdin> by default, points to the terminal/keyboard.
But it is not always true if you redirect or use pipes.
In other words, there are three ways that <stdin> can be used:
1) Terminal/keyboard, by default: cut -c2<enter>
2) Redirection of a file: cut -c2 input_file OR cut -c2 < input_file
3) Use of pipes: echo "abc123" | cut -c2
 

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LEARN ABOUT HPUX

tcgetsid

tcgetsid(3C)															      tcgetsid(3C)

NAME

       tcgetsid() - get terminal session ID

SYNOPSIS

DESCRIPTION

       The  function  returns the value of the session ID of the foreground process associated with the terminal referenced by fildes.	is allowed
       from a process that is a member of a background process group (see termio(7)).

RETURN VALUE

       Upon successful completion, returns the value of the session ID of the foreground  process  associated  with  the  terminal  referenced	by
       fildes.	Otherwise, returns a value of and sets to indicate the error.

ERRORS

       If the function fails, it sets (see errno(2)) to one of the following values:

	      [EACCES]	     The  file	associated with fildes is the controlling terminal of the calling process; however, there is no foreground
			     process group defined for the controlling terminal.

	      [EBADF]	     fildes is not a valid file descriptor.

	      [ENOTTY]	     The file associated with fildes is not the controlling terminal or the calling process does not  have  a  controlling
			     terminal.

SEE ALSO

       getsid(2), setsid(2), tcgetpgrp(3C), thread_safety(5).

																      tcgetsid(3C)
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