Random Dev useful commands

authorized_keys

: ~ $ cat .ssh / authorized_keys 
 command = "date" ssh-rsa AAAA [ ... ]
 
 # https://www.virtono.com/community/tutorial-how-to/restrict-executable-ssh-commands-with-authorized-keys/

chmod.md

So how do we use chmod to modify these permissions? We’ll use a command like:

$ chmod 771 my_app

OR

$ chmod g+w my_app

In the context above, these two commands in fact mean the same thing. To see why, we have to understand that chmod has a peculiarity. It accepts instructions to change file permissions for different users either by using combinations of these letters (text or symbolic format), or by using a system of numbers (numeric or octal format). Here’s how the two systems correspond:

Permission to read, r, is given the numeric value of 4 Permission to write, w, is given the value 2 Permission to execute, x, is given the value 1

cron.sh

contrab -e
0 7 * * * /path/to/script

crone.sh

# Put a shell script in one of these folders: /etc/cron.daily, /etc/cron.hourly, /etc/cron.monthly or /etc/cron.weekly.

# If these are not enough for you, you can add more specific tasks e.g. twice a month or every 5 minutes. Go to the terminal and type:

crontab -e
# This will open your personal crontab (cron configuration file). The first line in that file explains it all! In every line you can define one command to run and its schedule, and the format is quite simple when you get the hang of it. The structure is:

# minute hour day-of-month month day-of-week command
# For all the numbers you can use lists, e.g. 5,34,55 in the minutes field will mean run at 5 past, 34 past, and 55 past whatever hour is defined.

# You can also use intervals. They are defined like this: */20. This example means every 20th, so in the minutes column it is equivalent to 0,20,40.

# So to run a command every Monday at 5:30 in the afternoon:
30 17 * * 1 /path/to/command

# or every 15 minutes
*/15 * * * * /path/to/command

# Note that the day-of-week goes from 0-6 where 0 is Sunday.

docker.sh

### Copy folder to host form container
- sudo docker cp CONTAINER_ID:/var/www/bookstack/storage/uploads .

## Backup Mysql
- docker exec CONTAINER_ID /usr/bin/mysqldump -u bookstack --password=secret bookstack > backup.sql

## Run MYSQL docker container
- docker run -d --net bookstack_nw  -e MYSQL_ROOT_PASSWORD=secret -e MYSQL_DATABASE=bookstack -e MYSQL_USER=bookstack -e MYSQL_PASSWORD=secret  --name="bookstack_db"  mysql:5.7.21

## access docker container as root
- docker exec -u root -it [CONTAINER_ID] bash

### Grant www-data priviliges to folder
- sudo chown www-data:ww-data -R uploads/

### restart nginx if port changes
- sudo ln -s /etc/nginx/sites-available/wiki /etc/nginx/sites-enabled/\n
- sudo nginx -t
- sudo systemctl restart nginx

docker_priv.yml

sabnzbd:
  build: ./sabnzbd
  command: /syzygy/run.sh
  privileged: true

linux.sh

you can try just add

network_mode: "host"
example :

version: '2'
services:
  feedx:
    build: web
    ports:
    - "127.0.0.1:8000:8000"
    network_mode: "host"
list option available

network_mode: "bridge"
network_mode: "host"
network_mode: "none"
network_mode: "service:[service name]"
network_mode: "container:[container name/id]"

nginx.conf

server {
        listen 80;                      #says to listen on standard port
        server_name _;                  #the default server
        location / {                    #location is the root of the site
                root /test/a/;          #root is located at /test/a/  
                index test;        #index is for autocomplete
                autoindex on;           #this way files will be autoindexed
        }
}

Nginx.sh

#!/bin/sh
ssh user@src.com -t bash -ci "logs" >> report.log

# Remove duplicated lines
sort report.log | uniq > report_temp.log

# replace new items
mv -f report_temp.log report.log

# generating reports
cat report.log | docker run --rm -i -e LANG=$LANG allinurl/goaccess -a -o html --log-format COMBINED - > reports/report.html

permissions.sh

# Change owner user:group
chown tito:editors file.txt
chgrp webdev file.txt
chown -R webdev file.txt
 
# For example, to add the user geek to the group sudo , use the following command:
usermod -a -G sudo geek

# To change the primary group a user is assigned to, run the usermod command, replacingexamplegroup  with the name of the group you want to be the primary and exampleusernamewith the name of the user account.
usermod -g groupname username

# If you just want to list all the usernames without any additional information, you can use the compgen command with -u option.
compgen -u

# For example, to find out the members of a group with the name developers you would use the following command:
getent group developers

# https://www.howtogeek.com/50787/add-a-user-to-a-group-or-second-group-on-linux/

shell.js

You can execute any shell command using the shelljs module

const shell = require('shelljs')

shell.exec('./path_to_your_file')

Symboliclink.sh

# To create a symbolic link to target file from link name, you can use the ln command with -s option like this:
ln -s target_file link_name