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Tags: command-line   monitoring  
Link: 🔍 See Original Answer on Ask Ubuntu 🔗

URL: https://askubuntu.com/q/1036893
Title: how to time a certain part of an executable?
ID: /2018/05/16/how-to-time-a-certain-part-of-an-executable_
Created: May 16, 2018    Edited:  May 16, 2018
Upload: November 24, 2022    Layout:  post
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The easiest way is to put the time command in front of the command you are running. For example:

$ time locate display-auto
/etc/cron.d/display-auto-brightness
/home/rick/Downloads/display-auto-brightness
/home/rick/Pictures/display-auto-brightness conky.png
/home/rick/Pictures/display-auto-brightness systray.png
/home/rick/Pictures/display-auto-brightness-config 1.png
/home/rick/Pictures/ps display-auto-brightness.png
/lib/systemd/system-sleep/display-auto-brightness
/mnt/e/etc/cron.d/display-auto-brightness
/mnt/e/lib/systemd/system-sleep/display-auto-brightness
/mnt/e/usr/local/bin/display-auto-brightness
/usr/local/bin/display-auto-brightness

real	0m0.826s
user	0m0.803s
sys 	0m0.016s

We are using the locate command to find all the filenames with display-auto in the names. Simply insert the time command in front of the command.


Getting time for portion of script

You can use the $SECONDS variable inside your script to get the time for a portion of it. For example:

SECONDS=0
/bin/egrep -v "^#|^$" $BLOCKEDIPS_XS | while IFS= read -r ip
do
    # Append everything to droplist
    $IPTABLES -A droplist -i eth0 -s $ip -j LOG --log-prefix " Drop IP List blockxs "
    $IPTABLES -A droplist -i eth0 -s $ip -j DROP
done <"$BLOCKEDIPS_XS"
timer stops, shows elapsed time
BlockTime=$SECONDS
echo "Total time to block IPs: $BlockTime Seconds"

In this code the SECONDS is reset to zero and then obtained after a lengthy process occurs.

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