See how a minor change to your commit message style can make you a better programmer.
Format: <type>(<scope>): <subject>
<scope>
is optional
Magic words:
psql -U postgres
Some interesting flags (to see all, use -h
or --help
depending on your psql version):
-E
: will describe the underlaying queries of the \
commands (cool for learning!)-l
: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)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 |
# | |
# Himawari-8 Downloader | |
# | |
# | |
# | |
# This script will scrape the latest image from the Himawari-8 satellite, recombining the tiled image, | |
# converting it to a JPG which is saved in My Pictures\Himawari\ and then set as the desktop background. | |
# | |
# http://himawari8.nict.go.jp/himawari8-image.htm | |
# |
Note: "Forked" from Latency Numbers Every Programmer Should Know
Event | Nanoseconds | Microseconds | Milliseconds | Comparison |
---|---|---|---|---|
L1 cache reference | 0.5 | - | - | - |
Branch mispredict | 5.0 | - | - | - |
L2 cache reference | 7.0 | - | - | 14x L1 cache |
Mutex lock/unlock | 25.0 | - | - | - |
convert -density 256x256 -background transparent favicon.svg -define icon:auto-resize -colors 256 favicon.ico |
0 = Success | |
1 = Operation not permitted | |
2 = No such file or directory | |
3 = No such process | |
4 = Interrupted system call | |
5 = Input/output error | |
6 = No such device or address | |
7 = Argument list too long | |
8 = Exec format error |
image: docker:latest | |
variables: | |
REPOSITORY_URL: <AWS ACCOUNT ID>.dkr.ecr.eu-central-1.amazonaws.com/<ECS REPOSITORY NAME> | |
REGION: eu-central-1 | |
TASK_DEFINTION_NAME: <TASK DEFINITION NAME> | |
CLUSTER_NAME: <CLUSTER NAME> | |
SERVICE_NAME: <SERVICE NAME> | |
services: |