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comparing float with int / number

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# 1  
Old 05-19-2005
Question comparing float with int / number
Hi all,
I'm looking to modify a script to check disk space usage.

Here is the code at the moment:

Code:
#
# The control file, MONITOR_DISK_SPACE, must be in the format ... Drive:;threshold_percentage
# eg.
# C:;95
# D:;98
# E:;90
#
# For each line in the control file (MONITOR_DISK_SPACE) determine the drive to be checked.
#
for i in `cat $MONITOR_DISK_SPACE`
do
  MONITOR_DISK_DRIVE=`echo $i | cut -f1 -d';'`
  DISK_SPACE_THRESHOLD=`echo $i | cut -f2 -d';'`
  DISK_SPACE_USED=`df -Pk | grep -i $MONITOR_DISK_DRIVE | awk '{print $3}'`
  DISK_SPACE_TOTAL=`df -Pk | grep -i $MONITOR_DISK_DRIVE | awk '{print $2}'`
  DISK_SPACE_PERCENTAGE=`echo "scale=2; $DISK_SPACE_USED / $DISK_SPACE_TOTAL * 100" | bc` 
  #
  # Check that the drive is not 100% full.  If so report the error.
  #
  if [ $DISK_SPACE_PERCENTAGE -eq 100 ]  then
      echo "CRITICAL ERROR: Disk drive $MONITOR_DISK_DRIVE is 100% full" >> $LOG_FILE
      SEND_MAIL="Y"
  fi
  #
  # Check that the drive has not used space greater than the threshold.  If so report as a warning
  #
  if [ $DISK_SPACE_PERCENTAGE -gt $DISK_SPACE_THRESHOLD ]
  then
      echo "WARNING: Drive $MONITOR_DISK_DRIVE is at $DISK_SPACE_USED% capacity. This is greater than the check threshold of $DISK_SPACE_THRESHOLD%" >> $LOG_FILE
      SEND_MAIL="Y"
  fi
done
#

This is an extract from a larger script.

The line highlighted in red is obviously not going to work because it is comparing a float with an integer/number. How can I modify this if statement so that it can compare $DISK_SPACE_PERCENTAGE with 100 and the same with the second IF comparing the percentage used with a threshold amount?

Also you might ask why am I trying to calculate the percentage free when df already gives me this - well I am using MKSTOOL kit on a windows platform and there appears to be a bug with df reporting incorrect capacity percentages. See below:

Code:
$ df -Pk
Filesystem         1024-blocks        Used  Available  Capacity Mounted on
C:/                   12586927     4154963    8431964       34% C:/
D:/                   22916688    16775468    6141220       74% D:/
E:/                   71087592    61504460    9583132       27% E:/
//ehrperth1/e$        40909520    26162176   14747344       64% H:/

Any help or pointer on this?

Cheers,
Leigh.
Last edited by lelliott; 05-19-2005 at 06:47 AM..
# 2  
Old 05-19-2005
See this thread.
# 3  
Old 05-19-2005
Thanks for this.

Cheers,
Leigh.
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