Help with Shell script that monitors CPU Usage


 
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# 1  
Old 01-02-2019
Help with Shell script that monitors CPU Usage

I'm a newbie to shell scripting, I was given this script to modify. This script that monitors when CPU Usage is too high based off the top command. The comparison is not working as it should. Its comparing a decimal to a regualar interger. When it send me an email, it send an email and ignores the if statement. I receive an email if its below or above 90. I only need an email if its greater than 90. I use
Code:
 while :; do :; done

to run CPU up to 100%. and then test running the below script. Can you all please assist me in what I'm doing incorrectly here:

Code:
#!/bin/ksh
top -b -n 1 |head -8 >/tmp/cpu.text
sed -e '1,5d' /tmp/cpu.text >/tmp/cpu2.text
High_CPU=`cat /tmp/cpu2.text|tail -1|awk '{print $9}'`
host=`hostname`
if [ "$High_CPU -gt  90" ];
then
mail -s "High CPU USAGE on $host" test@test.comv < /tmp/cpu2.lst
fi
exit;

# 2  
Old 01-02-2019
Remove the quotation marks in the if statement
# 3  
Old 01-02-2019
When I remove the quotations, this is what I receive:
Code:
cputest.sh: line 6: [: 30.0: integer expression expected


Last edited by RavinderSingh13; 01-02-2019 at 10:38 AM.. Reason: Added code tags for user.
# 4  
Old 01-02-2019
without rewriting the whole thing to be more readable/efficient......
Code:
#!/bin/ksh
top -b -n 1 |head -8 >/tmp/cpu.text
sed -e '1,5d' /tmp/cpu.text >/tmp/cpu2.text
High_CPU=$(cat /tmp/cpu2.text|tail -1|awk '{print $9}' )
host=$(hostname)
if [ "$High_CPU" -gt  90 ]
then
mail -s "High CPU USAGE on $host" test@test.comv < /tmp/cpu2.lst
fi
exit

This User Gave Thanks to vgersh99 For This Post:
# 5  
Old 01-02-2019
Hey @vgersh99, I copied and pasted your script to make sure I wasnt missing anything and I receive the same error:

cputest.sh: line 6: [: 70.0: integer expression expected
# 6  
Old 01-02-2019
Quote:
Originally Posted by mhannor
Hey @vgersh99, I copied and pasted your script to make sure I wasnt missing anything and I receive the same error:

cputest.sh: line 6: [: 70.0: integer expression expected
most likely your High_CPU variable doesn't contain integer value.
Put the script in set -x and debug it from there.
# 7  
Old 01-02-2019
High_CPU is always a decimal from the top command. Does that help?

--- Post updated at 03:11 PM ---

Quote:
Originally Posted by vgersh99
most likely your High_CPU variable doesn't contain integer value.
Put the script in set -x and debug it from there.
This is the output from set -x

[dbtlst@asdv-snsc-tlst ~]$ sh cputest.sh
+ top -b -n 1
+ head -8
+ sed -e 1,5d /tmp/cpu.text
++ cat /tmp/cpu2.text
++ tail -1
++ awk '{print $9}'
+ High_CPU=57.9
++ hostname
+ host=asdv-snsc-tlst.dsns.cdc.gov
+ '[' 57.9 -gt 90 ']'
cputest.sh: line 7: [: 57.9: integer expression expected
+ exit
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