remove leading zero in bash

remove leading zero in bash

leading=“000100”

no_leading=$((10#$leading))

## no_leading —> 100

September 30, 2019 at 11:03AM

find by size

find by size

find ./ -type file -size +500M 

option: 

b - 512 block

c - byte

w - two bytes words

k - kilo

M - mega

G - giga

# find and display size. human readable

find ./ -type file -size +500M -exec ls -lh {} \;

September 19, 2019 at 02:22PM

UFW config ( ubuntu firewall config )

firewall config 

## install 

sudo apt-get install ufw 

## add port 

sudo ufw allow 22

sudo ufw allow 8081

sudo ufw allow 8082

## enable ufw

sudo ufw enable 

## check status

sudo ufw status

## delete allow port

Sudo ufw delete allow 2022   # 2022 allow를 삭제함.