maclarensg/date_time.md

Last active September 17, 2018 03:54

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date_time.md

Epoch

Current Epoch Time

echo $(($(date +'%s * 1000 + %-N / 1000000')))

Set Epoch time

echo $(($(date --date="Sep 17 00:00:00 SGT 2018" +'%s * 1000 + %-N / 1000000')))

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ssh.md

Ignore KnownHostsFile StrictHostKeyChecking

ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no [email protected]
Warning: Permanently added '192.168.0.100' (RSA) to the list of known hosts.
[email protected]'s password:

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system_check.md

Memory

Check top memory usage**

ps aux --sort -rss | awk '{print $1, $4}' | sed -n '1,30p'

sum with awk**

awk '{sum+=$2}END{print sum;}'

CPU

show top with threads

top -H

Ps show threads

ps -T -p <main pid>

ps -p <main pid> -L