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up vote 0 down vote favorite

I have following script to check disk usage

    #!/bin/bash

# set alert level 90% is default
ALERT=10

OIFS=$IFS
IFS=','

storage=$(df -H | grep -vE '^Filesystem|tmpfs|cdrom' | awk '{ print $5 " " $1 }')



for output in $storage ;

do
  echo "---------------@@@@@@@@@ output started @@@@@@@@@@@@@@@@-----------"
  echo $output
  echo "---------------@@@@@@@@@ output end @@@@@@@@@@@@@@@@-----------"

  usep=$(echo $output | awk '{ print $1}' | cut -d'%' -f1  )
  echo "---------------###### useo started ######-----------"
  echo $usep
  echo "---------------###### usep end ######-----------"

  if [ $usep -ge $ALERT ]; then

    echo "Running out of space \"$partition ($usep%)\" on $(hostname) as on $(date)" 
  fi
done

But when i am running this code i am getting the integer expression expected error at if conditional statement, Here is the output of this script 

  97% /dev/sda1
1% udev
0% none
2% none
---------------@@@@@@@@@ output end @@@@@@@@@@@@@@@@-----------
---------------###### useo started ######-----------
97
1
0
2
---------------###### usep end ######-----------
./fordiskfor.sh: line 24: [: 97
1
0
2: integer expression expected

I am new in scripting, can someone figure out why am i getting this error.

share|improve this question
    
$usep contains no integer. – Cyrus Nov 14 '14 at 6:12
    
what should i do – pushpendra chauhan Nov 14 '14 at 6:19
up vote 2 down vote

The problem is there:

if [ $usep -ge $ALERT ]; then
  ...
fi

$usep contains multiple lines of digits. To cycle trough all of them use somthing like this instead of that part:

for $space in $usep;
do
  if [ $space -ge $ALERT ]; then
    echo "Running out of space..."
  fi
done
share|improve this answer
up vote 0 down vote

The value stored in the variable $storage comprises of multiple lines. As a result, $output will also contain multiple lines, and so will $usep.

You can extract and compare all values stored in $usep, one by one, using another for loop as mentioned in this answer. Or you can use while statement as follows:

echo $storage | while read output
do      
    ...
    ...

    if [ $usep -ge $ALERT ]; then    
    echo "Running out of space \"$partition ($usep%)\" on $(hostname) as on $(date)"
  fi
done
share|improve this answer
    
Is this anything other than a repost of the question? – jasonwryan Nov 14 '14 at 7:06
    
I used while, whereas question contains for loop. – Mandar Shinde Nov 14 '14 at 7:37
    
Well rather than reprinting the whole script, perhaps just the relevent line and an explanation of why yuo think that is a better approach... – jasonwryan Nov 14 '14 at 7:40
    
I am very poor at explaining things. You could edit my answer if you wish to. – Mandar Shinde Nov 14 '14 at 7:42
    
@jasonwryan - I've tried to make my answer acceptable to you. Hope this answer makes you happy. – Mandar Shinde Nov 14 '14 at 8:18

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