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Full Discussion: Comparing a number in a text file with a specific value
Top Forums UNIX for Dummies Questions & Answers Comparing a number in a text file with a specific value Post 302491502 by Fitch on Friday 28th of January 2011 03:49:37 AM
Old 01-28-2011
Oooh! It's so close!

Thanks for the quick reply
Hit a bit of a snag though...

The script is:

Code:
#!/bin/bash
/usr/bin/digitemp_DS9097 -a -q -o"%.2C" -c /etc/digitemp.conf > /home/brafferton/Downloads/fridgedoor.txt

while true
do
  [ $(( $(</home/brafferton/Downloads/fridgedoor.txt) > 5.00 )) ] && echo ok || echo 'not ok'
done

I've left out the sleep 120 as cron does that.
Q: Is while do a never ending loop?

Anyway!
Typing in the command line:

brafferton@cameras:~/Downloads$ fridgedoor

gets:

/usr/bin/fridgedoor: line 6: 2.88 > 5.00 : syntax error: invalid arithmetic operator (error token is ".88 > 5.00 ")

---------- Post updated at 11:04 PM ---------- Previous update was at 08:45 PM ----------

I've been doing a lot of trawling and I think that either the CR at the end of the line, (and I presume there is one) is cocking up everything OR that bash won't do decimals, or both
If it's not the CR thingy then how would I strip the decimals off fridgedoor.txt i.e. if 6 > 5 then sound the alarm?

---------- Post updated 28-01-11 at 08:49 AM ---------- Previous update was 27-01-11 at 11:04 PM ----------

More trawling overnight and I've managed:

Code:
REAL=$(/usr/bin/digitemp_DS9097 -a -q -o"%.0C" -c /etc/digitemp.conf)
echo "${REAL} C"
if [ "${REAL}" -ge 5 ] ;then
echo door closed    
else
echo door open
fi

No Errors!
Seems to work...
Last edited by Yogesh Sawant; 02-01-2011 at 07:53 AM.. Reason: added code tags
 

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LEARN ABOUT OPENSOLARIS

getusershell

getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME

       getusershell, setusershell, endusershell - get legal user shells

SYNOPSIS

       #include <unistd.h>

       char *getusershell(void);

       void setusershell(void);

       void endusershell(void);

DESCRIPTION

       The  getusershell()  function  returns  a  pointer  to  a  legal  user  shell  as defined by the system manager in the file /etc/shells. If
       /etc/shells does not exist, the following locations of the standard system shells are used in its place:

	 /bin/bash		    /bin/csh
	 /bin/jsh		    /bin/ksh
	 /bin/ksh93		    /bin/pfcsh
	 /bin/pfksh		    /bin/pfsh
	 /bin/sh		    /bin/tcsh
	 /bin/zsh		    /sbin/jsh
	 /sbin/pfsh		    /sbin/sh
	 /usr/bin/bash		    /usr/bin/csh
	 /usr/bin/jsh		    /usr/bin/ksh
	 /usr/bin/ksh93 	    /usr/bin/pfcsh
	 /usr/bin/pfksh 	    /usr/bin/pfsh
	 /usr/bin/sh		    /usr/bin/tcsh
	 /usr/bin/zsh		    /usr/sfw/bin/zsh
	 /usr/xpg4/bin/sh

       The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells.

       The setusershell() function rewinds the file or the list.

       The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells.

RETURN VALUES

       The getusershell() function returns a null pointer on EOF.

BUGS

       All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved.

NOTES

       Restricted shells should not be listed in /etc/shells.

SunOS 5.11							    1 Nov 2007							  getusershell(3C)
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