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Grab the return value of df -H-m

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Top Forums Shell Programming and Scripting Grab the return value of df -H-m
# 1  
Old 11-19-2012
Tools Grab the return value of df -H-m
Hi to everyone Smilie

Quick question how do i grab the return value on the 5 position here :


Code:
sgs@sibs:~$ df -H -m
Sist.fichs     1M-blocos  Used    Available  Use%    Mounted on
/dev/sda1    35542         18904   14833       57%            /


In this case the Use% value .

I need to make like if [ Use eq 99% ] then bla bla bla bla . fi Smilie

tnx in advance
Last edited by joeyg; 11-19-2012 at 10:33 AM.. Reason: corrected spelling
# 2  
Old 11-19-2012
Code:
df -H -m | awk '$5 == "99%"{print "Bla bla"}'

# 3  
Old 11-19-2012
tnx for ur fast response do you know if is possible to get only the value from the Use percentage % Like if i got 99% of the disk used i will get a output of 99 only as a output from the command or if i have 70% of the disk being used i will get only 70 as a return value ?
# 4  
Old 11-19-2012
For a shell test you need to have one single item to compare to. If you have multiple file systems, you need to select one only for the test, as well as eliminate the header. On top, the percent sign will interfere with further calculations, thus should be eliminated as well. So you might want to try sth. like (working on linux/bash):
Code:
 [ "99" -eq $(df -h -m|awk '/sda1/{sub("%","",$5); print $5}') ] && echo "good" || echo "bad"

If you don't reduce the query to one item, you'll get sth. like
Code:
bash: [: too many arguments

Last edited by RudiC; 11-19-2012 at 08:15 AM.. Reason: Integer comparison (-eq or -gt/-lt) needed for numbers; string comp (<=, ==, <=) for strings
# 5  
Old 11-19-2012
hmmm i see i was doing this while i was asking to have a ideia how to do it my way was

Code:
df -H -m | awk '{print $4}' >  exemplo.txt 


if [ ´ cat exemplo.txt | grep -c 99 ´ = 1 ] 
then
   rm bla.zip
fi

# 6  
Old 11-19-2012
Your code has many improvement opportunities; e.g. use $5 instead of $4; the grep will also find numbers like 109920 (OK, not in col 5!), and, you can do all that in a one liner.
Give my proposal above a shot and post the results. btw - waiting until a disk is filled to 99% before counteracting may be too late ...
# 7  
Old 11-19-2012
@Rudic we can further reduce this to single awk.

Code:
[[ $(df -H -m | awk '$5 == "99%"') ]] && rm bla.zip
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