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Script has no result!! -gt -lt

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Top Forums Shell Programming and Scripting Script has no result!! -gt -lt
# 8  
Old 11-23-2015
The name of the variable isn't the issue. The reason your latest script is working is that you separated the variables from the opening and closing square bracket pairs with spaces.

You might, however, try a simpler method:
Code:
#!/bin/ksh
uptime | ( read _ _ days _
	years=$((days / 365))
	echo "$(hostname) has been running $years to $((years + 1)) years ($days days)."
)

or, if you're using a 1993 or later version of ksh, you might want something more like:
Code:
#!/bin/ksh
uptime | ( read _ _ days _
	years=$((days / 365.25))
	printf '%s has been running about %.2f years (%d days).\n' \
	    "$(hostname)" "$years" "$days"
)

Last edited by Don Cragun; 11-23-2015 at 06:03 AM.. Reason: Add ksh93 sample with fractional years.
# 9  
Old 11-23-2015
Hi...

Perhaps this might be of help, manually using OSX 10.7.5, default bash terminal:-
Code:
Last login: Mon Nov 23 11:02:51 on ttys000
AMIGA:barrywalker~> up=`uptime |awk {'print$3'}`
AMIGA:barrywalker~> echo "$up"
1:54,
AMIGA:barrywalker~> _

Perhaps $up is NOT a number...
# 10  
Old 11-23-2015
Quote:
Originally Posted by wisecracker
Hi...

Perhaps this might be of help, manually using OSX 10.7.5, default bash terminal:-
Code:
Last login: Mon Nov 23 11:02:51 on ttys000
AMIGA:barrywalker~> up=`uptime |awk {'print$3'}`
AMIGA:barrywalker~> echo "$up"
1:54,
AMIGA:barrywalker~> _

Perhaps $up is NOT a number...
Hi wisecracker,
The output you're showing looks like it came from printing $5; not $3. The normal output from uptime on OS X 10.11.1 looks something like:
Code:
 3:14  up 32 days, 11:43, 10 users, load averages: 1.72 1.61 1.57

But, the output format could have changed between 10.7.5 and 10.11.1.
# 11  
Old 11-23-2015
Hi Don...

Hmmm, perhaps there is a discrepancy...
Code:
Last login: Mon Nov 23 11:34:21 on console
AMIGA:barrywalker~> uptime
11:37  up 4 mins, 2 users, load averages: 0.63 0.44 0.19
AMIGA:barrywalker~> _

# 12  
Old 11-23-2015
Quote:
Originally Posted by wisecracker
Hi Don...

Hmmm, perhaps there is a discrepancy...
Code:
Last login: Mon Nov 23 11:34:21 on console
AMIGA:barrywalker~> uptime
11:37  up 4 mins, 2 users, load averages: 0.63 0.44 0.19
AMIGA:barrywalker~> _

Ah, yes. It appears that the format changes depending on how long the system has been running.
# 13  
Old 11-23-2015
Hi Don...

11:37 up 4 mins, 2 users, load averages: 0.63 0.44 0.19

The third field is NOT 4 days but 4 minutes, and this could be considered a bug except the OP has put and upper and lower limit on his requirements.
This value could be from 1 to 59 and must be taken into account if there was not a lower limit...
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