Leonids Maslovs leonardinius

tmux cheat sheet

(C-x means ctrl+x, M-x means alt+x)

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

(C-x means ctrl+x, M-x means alt+x)

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

FYI, for those of us running Debian based systems rather than RedHat, the BlueJeans RPM can be successfully installed via alien

Steps to install BlueJeans on Debian

Download BlueJeans RPM
Install alien package sudo apt-get install alien
Convert BlueJeans RPM to a DEB package sudo alien --to-deb --scripts bluejeans-*.rpm
Install resulting DEB sudo dpkg -i bluejeans_*.deb
Run BlueJeans with /opt/bluejeans/bluejeans-bin

You may get an error loading the expected udev library

Last major update: 25.08.2020

	Latency Comparison Numbers (~2012)
	----------------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns 3 us
	Send 1K bytes over 1 Gbps network 10,000 ns 10 us
	Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD

	-- show running queries (pre 9.2)
	SELECT procpid, age(clock_timestamp(), query_start), usename, current_query
	FROM pg_stat_activity
	WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%'
	ORDER BY query_start desc;

	-- show running queries (9.2)
	SELECT pid, age(clock_timestamp(), query_start), usename, query
	FROM pg_stat_activity
	WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%'

	'Twas the night before Christmas, when all through the racks
	Not a server was alerting, not even Compaqs.
	The backups were written to tapes with care
	In hopes that later the data would be there.

	The machines were nestled all snug in their sleds
	Whilst visions of vengeance danced in their heads;
	And oncall in his three-wolf and I in my rack.
	Had just settled down for some syn and some ack.

	#!/bin/sh

	# Make sure to:
	# 1) Name this file `backup.sh` and place it in /home/ubuntu
	# 2) Run sudo apt-get install awscli to install the AWSCLI
	# 3) Run aws configure (enter s3-authorized IAM user and specify region)
	# 4) Fill in DB host + name
	# 5) Create S3 bucket for the backups and fill it in below (set a lifecycle rule to expire files older than X days in the bucket)
	# 6) Run chmod +x backup.sh
	# 7) Test it out via ./backup.sh