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printing positional charaters in a loop


 
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# 1  
Old 09-06-2009
printing positional charaters in a loop

Code:
#!/bin/bash
usep=`df -hT | awk '{ print $5 }'`
for (1=1,1<8,i++)
output=`echo $usep | awk '{ print $i }'| cut -d'%' -f1`
echo $output
if [ $output -gt 10 ]
then
echo "critical value"

i need to echo critical value if disk usage pecentage xceeds 10

and i am face problem in position marked red here i am trying to print i where i represent postional parameter from 1to8 but i am not able to print
but i am able to get output if i am directly useing postional parameters instead of i ....

please suggest accordingly


Thanks in Advance

Jos

Last edited by bakunin; 09-06-2009 at 02:48 PM.. Reason: pursued my favourite pastime: giving code-tags to the needy
# 2  
Old 09-06-2009
Quote:
Originally Posted by josgeorge
...
i need to echo critical value if disk usage pecentage xceeds 10
...
$6 is the "Use %" column in my system's output.

Code:
df -hT | awk '{x=$6; sub(/%/,"",x); if (x > 10){print $0,"\t <= critical value"}}'

tyler_durden
# 3  
Old 09-06-2009
Not tested, -T don't work on my system.
Code:
df -hT | awk 'int($5) > 10{print $0,"\t <= critical value"}'

# 4  
Old 09-06-2009
Quote:
Originally Posted by danmero
Not tested, -T don't work on my system.
Code:
df -hT | awk 'int($5) > 10{print $0,"\t <= critical value"}'

It works, $5 just needs to changed to $6 :
Code:
df -hT | awk 'int($6) > 10 {print $0,"\t <= critical value"}'

Although I don't see why disk usage of more than 10% should be considered critical. Perhaps the OP means 90% ?

Last edited by Scrutinizer; 09-06-2009 at 01:10 PM..
# 5  
Old 09-06-2009
I think we need to know which Operating System and version. There is much variety in the "df" command.
For this purpose, sample input (from df -Ht) and sample expected output would do.

Last edited by methyl; 09-06-2009 at 02:44 PM..
# 6  
Old 09-06-2009
If you just want to filter out a positional part of the output you do not need awk at all:

Code:
read var1 var2 var3 ...

will break down the output and assign word 1 to var1, word 2 to var2 and so on. If there are more words than variables the last variable will get the remainder of the line. You can use a dummy variable over and over again to filter out what you are not interested in:

example (filter out the size only):

Code:
df -hT | tail -1 | read junk junk fssize junk

Your code could be simplified to (adjust the number of "junk"s to adapt to your systems output):

Code:
df -hT | while read fs_name junk junk junk junk fs_used_percent junk ; do
     if [ $fs_used_percent -gt 10 ] ; then
         echo "Warning: $fs_name usage above threshold"
     fi
done

I hope this helps.

bakunin

Last edited by bakunin; 09-06-2009 at 02:54 PM..
# 7  
Old 09-06-2009
Bi bakunin. No offence but the output from many versions of "df -k" contains a "%" sign suffixed to the value. O/P jossgeorge script suggests that this is one of those versions.

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