Using cat and awk.......


 
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# 1  
Old 11-30-2009
Using cat and awk.......

Im trying to use cat and awk to calculate the total space, then display it using the print command. But something in my script is not correct?

Code:
 cat | awk '{print$1}' | sort -n | grep -v used | awk '{sum += $1} END { p
rint sum;}'


??? Any help would be greatly appreciated!!

Last edited by radoulov; 11-30-2009 at 08:16 AM.. Reason: fixed code tags
# 2  
Old 11-30-2009
And what exactly are you trying to con-cat-enate?
# 3  
Old 11-30-2009
cat "nothing" | to awk.....

dammit beat me to it by 3 seconds...!
# 4  
Old 11-30-2009
lol~sorry guys. Do I have to use awk in shell scripting? Im new to scripting and I think that awk is confusisne me. I think I should stick to the basics first,

Im trying to display the output of the bdf command for filesystems, but I want to display total useage used, and total usage available.

Thanks in advance!
Bigben
# 5  
Old 11-30-2009
using shell (bash)
example only.
Code:
df -HP | { while read disk b c d used e
do    
        used=${used%?}
        case  "$used" in
        [5-9][0-9])
            echo "overload over 50%: $disk, used: $used%"
        esac
done 
}

# 6  
Old 11-30-2009
Imtrying to read the information, the use the bdf command to list the space used (etc). After that Im trying to get the info to display on the screen.

Below is what Ive been playing around with. While using the while do loop, do you have to use the output redirection?

Code:
while read list
do
        bdf $list
done <junk.txt | cat junk.txt | awk '{print$1}' | sort -n | grep -v used | awk '
{sum += $1} END { print sum;}'



---------- Post updated at 09:12 PM ---------- Previous update was at 09:07 PM ----------

I keep getting the error message:

cat: Cannot open junk.txt: No such file or directory,

I thought by using the awk/cat command it would create this file?

Bigben

Sorry If Im bothering anyone-just trying to learn.

Last edited by pludi; 12-01-2009 at 02:01 AM.. Reason: closed code block
# 7  
Old 11-30-2009
if you are trying to create junk.txt , and assuming it hasn't been created yet, then why are you reading it using the while loop first?? do it this way
Code:
bdf <options> | while read ....
do
    # do your stuff
done

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