Dear all:

I try to code script to realize function which is described as after:

I have tons of fles which is end with *.ping,  try to parse out 2
parameters from the last line of each file. The sentence is like as
following :

rtt min/avg/max/mdev = 136.200/136.643/137.152/0.612 ms, pipe 2

The two paremeters are :

1> avg , which is 136.643
2> mdev, which is 0.612

Thanks for any hint.

bin

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On 5 Jun 2006 13:23:48 -0700, yezi wrote:
> Dear all:
>
> I try to code script to realize function which is described as after:
>
> I have tons of fles which is end with *.ping,  try to parse out 2
> parameters from the last line of each file. The sentence is like as
> following :
>
> rtt min/avg/max/mdev = 136.200/136.643/137.152/0.612 ms, pipe 2
>
> The two paremeters are :
>
> 1> avg , which is 136.643
> 2> mdev, which is 0.612
>
> Thanks for any hint.

 #***************************************
************
# just a hint then

_ifs_bkup=$IFS

line="rtt min/avg/max/mdev = 136.200/136.643/137.152/0.612 ms, pipe 2"

IFS=" /"
set -- $(echo $line)
shift 6
echo avg=$2 mdev=$4
IFS=$_ifs_bkup

 #***************************************
************


For extra points
! bash script advanced documentation
http://tldp.org/LDP/abs/html/index.html
! bash script introduction to Linux documentation
http://tldp.org/LDP/intro-linux/html/index.html

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yezi wrote:
> Dear all:
>
> I try to code script to realize function which is described as after:
>
> I have tons of fles which is end with *.ping,  try to parse out 2
> parameters from the last line of each file. The sentence is like as
> following :
>
> rtt min/avg/max/mdev = 136.200/136.643/137.152/0.612 ms, pipe 2
>
> The two paremeters are :
>
> 1> avg , which is 136.643
> 2> mdev, which is 0.612

To get only the lines you care about :

grep 'min/avg/max/dev' *.ping

To parse a value from each line, pipe the line into awk to get just
the series of numbers:

awk '{print $4}'

Then use cut to get only the one you care about :

cut -d/ -f2			(for avg)
cut -d/ -f4			(for mdev)

For example, to get the avg from all the files:

grep 'min/avg/max/dev' *.ping | awk '{print $4}' | cut -d/ -f2

Hope that helps.

- Logan

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