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Full Discussion: Storing received value from send, spawned telnet session
Top Forums Shell Programming and Scripting Storing received value from send, spawned telnet session Post 302888843 by Chubler_XL on Monday 17th of February 2014 03:48:40 PM
Old 02-17-2014
Use expr, also note use .0 on end of constants to force floating point calculations.

As you can see with my test data it comes pretty close to what bc returns:

Code:
$ tail -5 iw_avg.expect 
set result [expr $result/20.0 ]
set resultStr 10*log(($result/10.0)/log(10))
set resultVal [expr 10*log(($result/10.0)/log(10))]

puts "Average RSSI $resultVal ($resultStr)"

$ ./iw_avg.expect testSrv
Average RSSI 51.740556616639076 (10*log((4067.05/10.0)/log(10)))

$ bc -l
10*l((4067.05/10)/l(10))
51.74055661663907746850

Last edited by Chubler_XL; 02-17-2014 at 05:24 PM..
 

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LEARN ABOUT SUNOS

script

script(1)							   User Commands							 script(1)

NAME

       script - make record of a terminal session

SYNOPSIS

       script [-a] [filename]

DESCRIPTION

       The  script  utility  makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the
       record is saved in the file typescript. See WARNINGS.

       The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends
       when the forked shell exits or when Control-d is typed.

OPTIONS

       The following option is supported:

       -a	Appends the session record to filename, rather than overwriting it.

NOTES

       script places everything that appears on the screen in filename, including prompts.

ATTRIBUTES

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

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

SEE ALSO

       attributes(5)

WARNINGS

       script  can  pose  a  security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a
       privileged user, that is, root. Be sure that typescript is not a link before running script.

SunOS 5.10							    30 Jan 2004 							 script(1)
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