Useful commands

commands.sh

# Join array in Bash

mount_lines=(
  "mount to test 123",
  "mount to test 545",
)

mount_lines_str=""

for line in "${mount_lines[@]}"
do
  mount_lines_str+="${line}\n"
done

# chmod for files only
chmod 644 $(find ./uploads -type f)

# NPM limit memory
NODE_OPTIONS=--max_old_space_size=512 npm install

# Parse JSON in Bash without jq

cat members.json | \
    python -c 'import json,sys;obj=json.load(sys.stdin);print obj["hits"]["hits"][0]["_source"]["xxx"]';

cat members.json | \
python -c '
import json, sys
obj=json.load(sys.stdin)
for y in [x["_source"]["xxx"] for x in obj["hits"]["hits"]]:
    print y
'

# multiline to file

cat << EOF > ./build/static/config.json
{
  "test": 235
}
EOF

# SSH tunnel

ssh dev.antiland -N -f -L 9308:sphinx.antiland:9308

# fast disk format
dd if=/dev/zero of=/dev/sdX bs=1M count=1

https://www.digitalocean.com/community/tutorials/how-to-create-raid-arrays-with-mdadm-on-ubuntu-16-04


# add user
useradd user1 -m -s /bin/bash

# default text editor
update-alternatives --config editor

# delete found files in (bash)
find . -name "FILE-TO-FIND" -exec rm -rf {} \;

# Copy directory to other server
tar -cf - /path/to/dir | ssh dest.server 'tar -xf - -C /path/to/parent/dir'

# compress file
tar -czvf archive.tar.gz stuff

# Copy file via netcat
nc -l -p 1234 > out.file
nc -w 3 [destination] 1234 < out.file

# Docker

docker run -p 127.0.0.1:3306:3306 --name my-mariadb -e MARIADB_ROOT_PASSWORD=pwd --restart unless-stopped -d mariadb

docker run -p 127.0.0.1:13306:3306 --name my-mysql -e MYSQL_ROOT_PASSWORD=pwd --restart unless-stopped -d mysql

docker run -p 127.0.0.1:5432:5432 --name my-postgres -e POSTGRES_PASSWORD=pwd --restart unless-stopped -d postgres # To connet use: ?sslmode=disable

docker run -p 127.0.0.1:27017:27017 --name my-mongo --restart unless-stopped -d mongo

docker run -p 127.0.0.1:6379:6379 --name my-redis --restart unless-stopped -d redis

# MacOS

# Restart VMWare
sudo /Applications/VMware\ Fusion.app/Contents/Library/services/services.sh --stop
sudo /Applications/VMware\ Fusion.app/Contents/Library/services/services.sh --start


# How to resize fs after disk size changed
https://unix.stackexchange.com/a/583544/342396


# Yandex Cloud S3 CLI config
alias ycs3='aws s3 --endpoint-url=https://storage.yandexcloud.net --profile=yc'