lazy-bash's Introduction

lazy-bash

Lazy bash belong here

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Random topics

Kill port ower

Kill testrpc that use 8545

lsof -t -i tcp:8545 | xargs kill

Multiple line .env

DO_OPTION=$(cat <<EOF
'{
  "name": "My-Droplet",
  "region": "nyc2",
  "size": "512mb",
  "image": "ubuntu-14-04-x64"
}'
EOF)

To see macOS power consumtion

system_profiler SPPowerDataType

Read .env

# Create some .env
echo "FOO=123" > .env

# Use it
source .env; echo $FOO

Creating a self-signed ssl cert

# Create cert.key and cert.pem for a certificate that is valid for the next 10 years.
openssl req -x509 -newkey rsa:4086 \
-keyout key.pem -out cert.pem \
-days 3650 -nodes -sha256

Output to file

> or 1> Redirects stdout to file.
2> Redirects stderr to file.
&> Redirects stdout and stderr to file.
/dev/null is a blackhole.
echo $'export NVM_DIR="$HOME/.nvm"\n. "/usr/local/opt/nvm/nvm.sh"' >> ~/.bash_profile

Add SSH to server

# Config
export [email protected]
export SSH_PUBKEY=~/.ssh/id_rsa.pub

# Add
ssh $SERVER sh -c "'cat >> .ssh/authorized_keys'" < $SSH_PUBKEY

# Verify
ssh $SERVER cat .ssh/authorized_keys

Fix Host key verification failed.

To fix WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!

ssh-keygen -R YOUR_HOST_IP_OR_DOMAIN

Replacement

Repace $FOO with BAR

src='Hello $FOO'
match='$FOO'
repl='BAR'
echo ${src/$match/$repl}
# Hello BAR

Replace template file with `ENV`

# Create template
echo "Hello {{FOO}}" > foo.conf.tmpl

# Replace {{FOO}} with FOO variable and output to new foo.conf file 
sed -e "s|{{FOO}}|$FOO|g" foo.conf.tmpl > foo.conf

# Multiple replacement
sed -e "s|{{FOO}}|$FOO|g;s|{{BAR}}|$BAR|g" foo.conf.tmpl > foo.conf

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