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Full Discussion: Get coprocess output into var
Top Forums Shell Programming and Scripting Get coprocess output into var Post 302254673 by dan-e on Wednesday 5th of November 2008 12:45:18 AM
Old 11-05-2008
Question Get coprocess output into var
This is probably a simple one for the wise.

I have just started using a coprocess (first time) in order to facilitate telnet'ing from inside a shell script. It's working, but when I run a remote command I need to get the output into a local variable, but alas my kung-fu is weak.

Code:
#! /usr/bin/ksh                                        |
                                                       |
DELAY=1                                                | <= Sleep delay
UNAME=d269836                                          | <= Login credentials
PWORD=my_password                                      |
SUPWORD=su_password                                    | <= su login credentials (i know i know)
                                                       |
exec 4>&1                                              | <= Make cop output > stdout
telnet mmm2 >&4 2>&4 |&                                | <= Start cop
sleep $DELAY                                           |
print -p $UNAME                                        | <= Login
sleep $DELAY                                           |
print -p $PWORD                                        |
sleep $DELAY                                           |
print -p su -                                          | <= Go su on remote host
sleep $DELAY                                           |
print -p $SUPWORD                                      |
sleep $DELAY                                           |
print -p clear                                         | <= Clear telnet junk from screen
sleep $DELAY                                           |
print -p cO=\$\(/my_command \)\>/dev/null 2\>/dev/null | <= This *will* put the figure into $cO, but I think $cO 
sleep $DELAY                                           |    is local to the telnet session on remote host?
echo $cO                                               | <= Therefore the output from this is nothing.    
sleep $DELAY                                           |

I used the sample supplied by Perderabo to construct this (very handy, props to Perderabo!! => https://www.unix.com/shell-programming-scripting/11359-need-script-passwd-cant-use-expect-tool-3.html#post40791), and I basically understand the idea of coprocesses, but I just can't get succinct output back into a local variable. I have also tried running my_command in background (and not) followed (and preceded) by a "read -p cO" but the read just sits there and halts the script until ^C.


Any takers?
Last edited by dan-e; 11-05-2008 at 06:57 PM.. Reason: bump
 

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LEARN ABOUT OSF1

delay

DELAY(9r)																 DELAY(9r)

NAME

       DELAY - General: Delays the calling routine a specified number of microseconds

SYNOPSIS

       void DELAY(
	       int Specifies n );

ARGUMENTS

       Specifies the number of microseconds for the calling process to spin.

DESCRIPTION

       The  DELAY  routine  delays  the  calling  routine  a  specified  number of microseconds.  DELAY spins, waiting for the specified number of
       microseconds to pass before continuing execution.

       For example, the following code results in a 10000-microsecond (10-millisecond) delay:

	.
	.
	.
	DELAY(10000);
	.
	.
	.

       The range of delays is system dependent, due to its relation to the granularity of the system clock. The system defines the number of clock
       ticks per second in the hz variable. Specifying any value smaller than 1 Hz to the DELAY routine results in an unpredictable delay. For any
       delay value, the actual delay may vary by plus or minus one clock tick.

       Using the DELAY routine is discouraged because the processor will be consumed for the specified time interval and therefore is  unavailable
       to  service other processes. In cases where kernel modules need timing mechanisms, you should use the sleep and timeout routines instead of
       the DELAY routine.  The most common usage of the DELAY routine is in the system boot path. Using DELAY in the boot path is often acceptable
       because there are no other processes in contention for the processor.

RETURN VALUES

       None

SEE ALSO

       Routines: sleep(9r), timeout(9r)

																	 DELAY(9r)
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