topic Re: scripting advice in Operating System - HP-UX

scripting advice

Steve Massey_1 — Thu, 11 Jan 2001 14:41:12 GMT

Hi

I am developing an interactive monitor script. It works fine, but I am looking for a more subtle use of awk/sed in the disp() function.
I am hoping to replace the amount of greping being done.
Is there a better way ??

Thanks for any help

Steve

Re: scripting advice

Dan Hetzel — Thu, 11 Jan 2001 14:57:41 GMT

Hi Steve,

You could combine the 2 first 'grep' into one:

grep "LV Name" /tmp/vgout | awk -F/ '{print $3,$4}' | read vgp lvgp

My 2 cents,

Dan

Re: scripting advice

Dan Hetzel — Thu, 11 Jan 2001 15:04:57 GMT

Hi again,

Another line, reading:

echo $vgp $lvgp $mirr1 $stat1 | awk '{printf " %-10s %-10s %-10s %-10s\n",$1, $2, $3, $4}'

could be replaced with:

printf " %-10s %-10s %-10s %-10s\n" $vgp $lvgp $mirr1 $stat1

That makes 4 cents !! ;7)

Dan

Re: scripting advice

Dan Hetzel — Thu, 11 Jan 2001 15:10:53 GMT

Hi,

You could use the 'line search' feature of 'awk' to find all the strings you're looking for in displ. Instead of running 4 'grep' and 4 'awk' programs, you could combine this in one simple 'awk' outputting 4 values that is piped into a read statement.

6 cents, still far from a full buck !

Dan

Re: scripting advice

Andreas Voss — Thu, 11 Jan 2001 15:23:03 GMT

Hi,

here my version of the function displ()

displ()
{
/usr/sbin/lvdisplay -v $b 2>/dev/null | awk '{
if($0 ~ "LV Name")
{
split($0, a, "/");
vgp=a[3];
lvgp=a[4];
}
if($0 ~ "LV Status")
{
if($3 == "available/syncd")
status="Good";
else
status="Bad";
}
if($0 ~ "Mirror copies")
{
if($3 == "1")
mirror="Yes";
else
mirror="No";
printf(" %-10s %-10s %-10s %-10s\n", vgp, lvgp, mirror, status);
}
}'
}

Regards

Re: scripting advice

Steve Massey_1 — Thu, 11 Jan 2001 17:38:13 GMT

Guys

- looks good to me

Thanks for your help

Steve

Re: scripting advice

Shannon Petry — Fri, 12 Jan 2001 15:00:51 GMT

As Andreas so nicely shows, awk can be used to do many tasks. Awk understands regular expressions, line and body searches, and prints very nicely with "printf".
Any time your are taking output from grep and piping to awk, the grep can be omitted. (Maybe a rare case where it can not, but I have never seen any...)
I.E.
ps -ef|grep inetd|awk '{print $2}
can be replaced with
ps -ef|awk '/"inetd"/ {print $0}'
NOTE: Certain shells will give you the awk process as well.....But I think you get the point....

Best regards,
Shannon

PS. O'Reilly and Associates puts out a great book on sed and awk. If you dont have it, it is definately worth the $30 bucks or so!