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How can I extract a string?

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Top Forums Shell Programming and Scripting How can I extract a string?
# 1  
Old 09-05-2011
Question How can I extract a string?
Hi all,

This might be a very small question..

Code:
df -h . | grep %
Filesystem            Size  Used Avail Use% Mounted on
                      4.0G  3.4G  356M  91% /t3appsoftware

How can I extract the string appended with %. The output should be "91" here.

" I have a query here for this.

Code:
df -h .| awk '/[0-8]%/' |awk '{print $(NF-1)}' | cut -c 1,2

"

=>
Code:
df -h .| awk '/[0-8]%/' |awk '{print $(NF-1)}' | cut -c 1,2
91

But looks like a bit confusing..I expect a better query command then the above and also how can I use only one awk instead of two..? Please post any useful links about shell programming. I'm using the Korn shell.

Thanks in advance..
Last edited by pludi; 09-05-2011 at 03:30 AM..
# 2  
Old 09-05-2011
Code:
df -h . | sed -rn '$ s/.* ([0-9]+)%.*/\1/p'

Change the regex to BRE if your sed doesn't have -r option.
# 3  
Old 09-05-2011
Code:
 
df -h . | nawk ' $4~/%/ {print substr($4,length($4)-2,length($4-1))}'

---------- Post updated at 11:23 AM ---------- Previous update was at 11:21 AM ----------

I checked for $4, you can use $(NF-1)
# 4  
Old 09-05-2011
Hi,

Code:
df -h . | nawk ' $4~/%/ {print substr($4,length($4)-2,length($4-1))}'

nawk - do we have this command? Or its a typo and just simply awk.

Throwing an error when I execute the above.

---------- Post updated at 01:00 AM ---------- Previous update was at 12:58 AM ----------

=>
Code:
df -h . | awk ' $4~/%/ {print substr($4,length($4)-2,length($4-1))}'
91

thanks.. Able to excute Smilie

Moderator's Comments:
Mod Comment Please use [CODE] tags when posting command lines, etc.
Last edited by pludi; 09-05-2011 at 03:31 AM..
# 5  
Old 09-05-2011
we have awk, nawk, gawk

I am in solaris, so i always use nawk
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