improve shell script awk & sed - shell

Question

I want to monitor Disk IO of a server and want to set different threshold for
the warning if %busy above 60% and
error if %busy above 80%.
From sar output need to find error disk with more than 80% busy and on 2nd line need disk more than 60 but less than 80% busy if disk not crossing theresholds then it should print 'ok' for respective category
I've created a script which will do this, but is there a better way to run sar just one time and use the same output for error & warning threshold? My system is AIX 6.1.
sar -d 2 2 |sed -n '/Average/,$p'|
sed -e 's/Average//g'|
awk 'NR> 1 {
if ($2 >80) {
print $1, $2; f=1
}
}
END { if (!f) print "ok" }'
sar -d 2 2 |
sed -n '/Average/,$p'|
sed -e 's/Average//g'|
awk 'NR> 1{ if ($2 >60 && $2 <81) { print $1, $2; f=1; } }
END { if (!f) print "ok" }'
Pls find my updated script below
bash-3.00$ cat diskio.sh
#!/bin/bash
a=`sar -d 2 2 |sed -n '/Average/,$ {s/Average//g;p;}'`
e=`$a|awk 'NR> 1{ if ($2 >40) { print $1, $2; f=1; } }
END { if (!f) print "ok" }'`
w=`$a|awk 'NR> 1{ if ($2 <40 && $2 >20) { print $1, $2; f=1; } }
END { if (!f) print "ok" }'`
echo $e
echo $w
bash-3.00$ sh -v diskio.sh
#!/bin/bash
a=`sar -d 2 2 |sed -n '/Average/,$ {s/Average//g;p;}'`
e=`$a|awk 'NR> 1{ if ($2 >40) { print $1, $2; f=1; } }
END { if (!f) print "ok" }'`
diskio.sh[3]: hdisk18: not found.
w=`$a|awk 'NR> 1{ if ($2 <40 && $2 >20) { print $1, $2; f=1; } }
END { if (!f) print "ok" }'`
diskio.sh[4]: hdisk18: not found.
echo $e
ok
echo $w
ok
bash-3.00$ sar -d 2 2 |
sed -n '/Average/,$ {s/Average//g;p;}'|
awk 'NR> 1{ if ($2 >40) { print $1, $2; f=1; } }
END { if (!f) print "ok" }'
hdisk79 135
hdisk101 85
bash-3.00$

Answer 1

sed -n '/Average/,$p'|sed -e 's/Average//g'
could be replaced by
sed -n '/Average/,$ {s/Average//g;p;}'
but sed does not make any evaluation of value (compare) easily so the awk for all is a better solution

Answer 2

This can be shorten some.
sar -d 2 2 | awk '/Average/ {t=1;next} t && NR>1 && $2>80 {print $1,$2;f=1} END { if (!f) print "ok" }'
This should do what you want
sar -d 2 2 | awk '/Average/ {t=1;next} t && NR>1 {if ($2>80) h=1;if ($2>60) l=1} END {if (h) {print "80+";exit};if (l) print "60+"}'
It will print 60+ if its above 60 and 80+ above 80
Or store it to a variable
status=$(sar -d 2 2 | awk '/Average/ {t=1;next} t && NR>1 {if ($2>80) h=1;if ($2>60) l=1} END {if (h) {print "H";exit};if (l) print "L"}')
Here it set status to L for 60+ and H for 80+
This should also print the status:
sar -d 2 2 | awk '/Average/ {t=1;next} t && NR>1 {if ($2>80) h=1;if ($2>60) {print $1,$2;l=1}} END {if (!l) print "ok"}'