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# <hash> = Docker file system overlay hash value
docker ps -qa | xargs -I{} bash -c "docker inspect {} | grep <hash> && echo {}"

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aws ec2 describe-instances --filter "Name=instance-state-name,Values=running" --query "Reservations[*].Instances[*].[PrivateIpAddress, Tags[?Key=='Name'].Value|[0]]" --output tex

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3s/\(.\{-}\zsPATTERN\)\{N}/REPLACE/

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aws inspector preview-agents --preview-agents-arn arn:aws:inspector:{TEMPLATE_ARN}

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aws ec2 describe-instances --filter "Name=instance-state-name,Values=running" --query "Reservations[*].Instances[*].[PrivateIpAddress, Tags[?Key=='Name'].Value|[0]]" --output text

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echo -n "${String}" | openssl enc -d -aes-256-cbc -a -salt

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openssl s_client -connect incomplete-chain-site.com:443 -servername incomplete-chain-site.com

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git config --global init.defaultBranch main

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SELECT relname, n_live_tup, n_dead_tup, trunc(100*n_dead_tup/(n_live_tup+1))::float "ratio%",
to_char(last_autovacuum, 'YYYY-MM-DD HH24:MI:SS') as autovacuum_date, 
to_char(last_autoanalyze, 'YYYY-MM-DD HH24:MI:SS') as autoanalyze_date
FROM pg_stat_all_tables 
ORDER BY last_autovacuum;

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Enable SSH on a headless Raspberry Pi (add file to SD card on another machine)

For headless setup, SSH can be enabled by placing a file named ssh, without any extension, onto the boot partition of the SD card from another computer. When the Pi boots, it looks for the ssh file. If it is found, SSH is enabled and the file is deleted. The content of the file does not matter; it could contain text, or nothing at all.

If you have loaded Raspbian onto a blank SD card, you will have two partitions. The first one, which is the smaller one, is the boot partition. Place the file into this one.