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Full Discussion: How does a if works in shell
Top Forums Shell Programming and Scripting How does a if works in shell Post 302576206 by frappa on Thursday 24th of November 2011 03:05:04 AM
Old 11-24-2011
Hi,

when comparing string (sorting) order replace the if..else conditional statement with:

Code:
[[ "$A" > "X10" ]] && echo "$A is correct" || echo "$A is incorrect"

Which basically means:
if the test inside the double square brackets returns true, display "$A is correct" else display "$A is incorrect".

You can find more about [[ ]] tests in bash man page, section 'Compound Commands'.

Keep in mind that you are comparing strings, so "X9" is actually > (that is, greater than) "X10".

see ya
fra
Last edited by frappa; 11-24-2011 at 04:07 AM.. Reason: added further explanation
 

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LEARN ABOUT SUSE

plmpower

plmpower(8)							     powerman							       plmpower(8)

NAME

       plmpower - control Insteon/X10 devices via SmartLabs PLM 2412S

SYNOPSIS

       plmpower --device serial-port

DESCRIPTION

       plmpower is a helper program for powerman which enables communication with Insteon/X10 devices via SmartLabs Power Line Modem, model 2412S.
       It is run interactively by the powerman daemon.	It can also be useful as a standalone tool for debugging X10/Insteon networks based on the
       above device.

NETWORK SETUP

       Note  the  addresses  of  your Insteon/X10 devices.  Plug the PLM into an AC outlet, preferably on the same electrical phase as the devices
       under control.  Devices are available to bridge phases if this is not possible.

       Attach the PLM's serial port to your computer, and ensure that nothing else is using  the  serial  port	such  as  the  system  console	or
       getty(8).  Run plmpower and try the interactive commands below to see if the devices respond reliably.

       Once everything is working, configure powermand to run plmpower as a coprocess as described in powerman.conf(5).

OPTIONS

       -d, --device serial-port
	      Specify the path to the special file connected to the PLM's serial port.

       -t, --timeout msec
	      Set the Insteon timeout to the specified number of milliseconds (default 1000).

       -x, --x10-attempts number
	      Set  the	number of times to run every X10 command (default 3).  X10 does not provide an ACK/NAK mechanism like Insteon so we cannot
	      be certain that any particular X10 command completed, therefore X10 commands are issued multiple times to increase confidence.

INTERACTIVE COMMANDS

       The following commands are accepted at the plmpower> prompt.  Address arguments may be Insteon (e.g. 1A.2B.3C) or X10 (e.g. G12).

       help   Display help on the available commands.

       info   Get info about the PLM.

       reset  Reset the PLM (clears the all-link db).

       on addr
	      Turn on device.

       off addr
	      Turn off device.

       status addr
	      Query status of device (Insteon only).

       ping addr
	      Time round trip request/response to device (Insteon only).

FILES

       /usr/sbin/plmpower
       /etc/powerman/powerman.conf

ORIGIN

       PowerMan was originally developed by Andrew Uselton on LLNL's Linux clusters.  This software is open source and distributed under the terms
       of the GNU GPL.

SEE ALSO

       powerman(1), powermand(8), httppower(8), plmpower(8), vpcd(8), powerman.conf(5), powerman.dev(5), powerman-devices(7).

       http://sourceforge.net/projects/powerman

powerman-2.3.5							    2009-02-09							       plmpower(8)
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