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Full Discussion: "integer expression expected" error with drive space monitoring script
Operating Systems Linux Fedora "integer expression expected" error with drive space monitoring script Post 302384397 by wbdevilliers on Tuesday 5th of January 2010 06:57:49 AM
Old 01-05-2010
"integer expression expected" error with drive space monitoring script
Hi guys,

I am still kinda new to Linux.

Script template I found on the net and adapted for our environment:

Code:
#!/bin/sh
#set -x
ADMIN="admin@mydomain.com"
ALERT=10
df -H | grep -vE '^Filesystem|tmpfs|cdrom' | awk '{ print $5 " " $1 }' | while read output;
do
  #echo $output
  usep=$(echo $output | awk '{ print $1}' | cut -d'%' -f1  )
  partition=$(echo $output | awk '{ print $2 }' )
  if [ $usep -ge $ALERT ]; then
    echo "Running out of space \"$partition $usep% used\" on $(hostname) as on $(date)" |
     mail -s "Alert:$(hostname) almost out of disk space $usep% used" $ADMIN
  fi
done

I get the following errors:

Code:
./monitor_EMAIL.sh: line 12: [: /dev/mapper/VolGroup00-LogVol00: integer expression expected
./monitor_EMAIL.sh: line 12: [: /: integer expression expected

This the output I get with the "set -x" enabled:

Code:
[root@s-webservice scripts]# ./monitor_EMAIL.sh
./monitor_EMAIL.sh: line 12: [: /dev/mapper/VolGroup00-LogVol00: integer expression expected
./monitor_EMAIL.sh: line 12: [: /: integer expression expected
[root@host scripts]# vim monitor_EMAIL.sh
[root@host scripts]# ./monitor_EMAIL.sh
+ ADMIN=admin@mydomain.com
+ ALERT=10
+ df -l
+ grep -vE '^Filesystem|tmpfs|cdrom'
+ awk '{ print $5 " " $1 }'
+ read output
++ echo /dev/mapper/VolGroup00-LogVol00
++ awk '{ print $1}'
++ cut -d% -f1
+ usep=/dev/mapper/VolGroup00-LogVol00
++ echo /dev/mapper/VolGroup00-LogVol00
++ awk '{ print $2 }'
+ partition=
+ '[' /dev/mapper/VolGroup00-LogVol00 -ge 10 ']'
./monitor_EMAIL.sh: line 12: [: /dev/mapper/VolGroup00-LogVol00: integer expression expected
+ read output
++ echo / 149186740
++ awk '{ print $1}'
++ cut -d% -f1
+ usep=/
++ echo / 149186740
++ awk '{ print $2 }'
+ partition=149186740
+ '[' / -ge 10 ']'
./monitor_EMAIL.sh: line 12: [: /: integer expression expected
+ read output
++ echo 16% /dev/sda1
++ awk '{ print $1}'
++ cut -d% -f1
+ usep=16
++ echo 16% /dev/sda1
++ awk '{ print $2 }'
+ partition=/dev/sda1
+ '[' 16 -ge 10 ']'
++ hostname
++ hostname
++ date
+ echo 'Running out of space "/dev/sda1 16% used" on host as on Tue Jan  5 12:34:16 SAST 2010'
+ mail -s 'Alert:host almost out of disk space 16% used'
admin@mydomain.com
+ read output

I set the ALERT level low just to test the script.
This is on Fedora Core 5.
The same script works fine on all other versions like CentOS5, Redhat etc...
Last edited by pludi; 01-05-2010 at 08:02 AM.. Reason: code tags, please...
 

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LEARN ABOUT CENTOS

kpartx

KPARTX(8)						   Linux Administrator's Manual 						 KPARTX(8)

NAME

       kpartx - Create device maps from partition tables

SYNOPSIS

       kpartx [-a | -d | -l] [-v] wholedisk

DESCRIPTION

       This  tool,  derived  from  util-linux'	partx,	reads partition tables on specified device and create device maps over partitions segments
       detected. It is called from hotplug upon device maps creation and deletion.

OPTIONS

       -a     Add partition mappings

       -r     Read-only partition mappings

       -d     Delete partition mappings

       -u     Update partition mappings

       -l     List partition mappings that would be added -a

       -p     set device name-partition number delimiter

       -f     force creation of mappings; overrides 'no_partitions' feature

       -g     force GUID partition table (GPT)

       -v     Operate verbosely

       -s     Sync mode. Don't return until the partitions are created

EXAMPLE

       To mount all the partitions in a raw disk image:

	      kpartx -av disk.img

       This will output lines such as:

	      loop3p1 : 0 20964762 /dev/loop3 63

       The loop3p1 is the name of a device file under /dev/mapper which you can use to access the partition, for example to fsck it:

	      fsck /dev/mapper/loop3p1

       When you're done, you need to remove the devices:

	      kpartx -d disk.img

SEE ALSO

       multipath(8) multipathd(8) hotplug(8)

AUTHORS

       This man page was assembled By Patrick Caulfield for the Debian project. From documentation provided by	the  multipath	author	Christophe
       Varoqui, <christophe.varoqui@opensvc.com> and others.

								     July 2006								 KPARTX(8)
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