hdparm -tT /dev/sda Grab result into variable

Question

Ok I am trying to find a way I can run

hdparm -t /dev/sda

10 time and grab the output and get an average result.

This does not give me what I am looking for: Can't figure out how to grab just the MB/sec

counter=1
total=''
average=''
while [ $counter -le 10 ] 
do 
 echo " "
 echo -n "SD Card Read Cache Test: $counter"
 output=$(sudo hdparm -T /dev/mmcblk0 )
 echo " "
 total=$total+$output
 ((counter++))
done
average=$((total/10))
echo $average

Cupcake Protocol · Accepted Answer · 2018-09-12T20:42:58.507

2

If that's the only problem you have:

output=$(sudo hdparm -t /dev/sda 2>&1 | sed -e '/Timing buffered/ s/.*= *\([0-9.]*\).*/\1/ p; d')

edited Sep 12 '18 at 20:42

answered Sep 12 '18 at 19:19

Cupcake Protocol

661
3
10

when I echo $output it is blank – Albert Mulder Sep 12 '18 at 19:31
sudo hdparm -t /dev/sda 2>&1 outputs /dev/sda: Timing buffered disk reads: 106 MB in 3.01 seconds = 35.22 MB/sec and I just want the 35.22 – Albert Mulder Sep 12 '18 at 19:33
When I run the command I gave, `echo $output` gives me `126.48`. Perhaps there is more than one space after the = sign? Try changing `s/.*= \(` to `s/.*= *\(` – Cupcake Protocol Sep 12 '18 at 19:43
That fixed it by adding in the *. Thanks!, I will mark as Answer, if you can edit it fo others. :) – Albert Mulder Sep 12 '18 at 19:48

hdparm -tT /dev/sda Grab result into variable

1 Answers1