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Full Discussion: Using here document when passing arguments
Top Forums Shell Programming and Scripting Using here document when passing arguments Post 302909825 by Scrutinizer on Sunday 20th of July 2014 06:20:25 AM
Old 07-20-2014
This is expected behavior. If there is too much input then the last lines never get read. If there is no more input on stdin then the other values get empty values. It is up to the script to provide additional checks..

One approach may be to provide an alternative source if the first one dries up. For example:

Code:
#!/bin/ksh
read x || read x < /dev/tty
read y || read y < /dev/tty
read z || read z < /dev/tty

echo x: $x y: $y z: $z
# read few more things again

read a || read a < /dev/tty
read b || read b < /dev/tty

echo a: $a b: $b


or

Code:
#!/bin/ksh
{
read x || read x <&3
read y || read y <&3
read z || read z <&3

echo x: $x y: $y z: $z
# read few more things again

read a || read a <&3
read b || read b <&3

echo a: $a b: $b
} 3</dev/tty

Last edited by Scrutinizer; 07-20-2014 at 09:49 AM..
This User Gave Thanks to Scrutinizer For This Post:
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LEARN ABOUT DEBIAN

startsrv

STARTSRV(8)						      System Manager's Manual						       STARTSRV(8)

NAME

       startsrv - invoke ttysrv for a particular host.

SYNOPSIS

       startsrv host

DESCRIPTION

       startsrv  fires	up  ttysrv  for  a  given  host.  It  will  kill  any  already	running  instance  for	that  host, then read /etc/remote-
       tty/opt/<host>.srv for any options to pass to ttysrv (defaulting to those that set 9600,8n1), /etc/remote-tty/prot/<host>.sock for the per-
       missions the socket should be set to (default 660), /etc/remote-tty/owner/<host>.sock for the owner of the socket (default rttymgr:dialout)
       and /etc/remote-tty/prot/<host>.log for the permissions of the logfile (default 640).

       The device node used is /etc/remote-tty/dev/<host>. This will normally be a symlink to the correct file in /dev.

       ttysrv is configured to log to /var/log/remote-tty/<host>/<host>, with a  pidfile  at  /var/run/remote-tty/pid/<host>  and  the	socket	at
       /var/run/remote-tty/sock/<host>.

SEE ALSO

       remote-tty(1), ttysrv(8).

AUTHOR

       rtty was written by Paul Vixie <vixie@isc.org>. This manual page was written by Jonathan McDowell <noodles@earth.li> for the Debian project
       (but may be used by others).

								   May 23, 2006 						       STARTSRV(8)
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