Bash

Function	Code
Check storage	`df -h`
Check storage	`du -hs foldername`
Physical volumes	`pvs`
Remove	rm -rf sth
System usage monitor	`htop`
CPU information	`lscpu`
Check drives	`lsblk`
Check GPU	`sudo lshw -C display` / `lspci \| grep -e VGA`

1. Building from source (with python)

cd software
mkdir build
cd build
cmake -D BUILD_WITH_PYTHON=ON -DCMAKE_INSTALL_PREFIX=<install_path> ..
sudo make install
export LD_LIBRARY_PATH=<install_path>/lib/:$LD_LIBRARY_PATH
export PYTHONPATH=<install_path>/lib/python3.11/site-packages:$PYTHONPATH

Ports

To kill everything listening to a port: sudo fuser -k 2121/tcp

Profile

Create a hidden file called .bashrc in your home folder and add aliases for different commands as:

alias something='ssh -Y uder@server.com'

So something will always execute the command ssh -Y uder@server.com.

Screen

Create a screen: screen -S name
Detach from the screen with keyboard shortcut: ctrl+a d
See a list of screens: screen -ls
Attach to the desired screen: screen -r name
Detach from outside (not needed usually): screen -d -r name

Server

ssh -Y user@10.50.17.66 # login
ssh -N -f -L localhost:8889:localhost:8889 user@address # tunneling

Login to server using private key:

Create a private-public ssh key pair.
Your private key should be inside the folder ~/.ssh/
Change permission of the folder: sudo chmod -R 700 ~/.ssh
Then log in: ssh -Y username@server

Users and Groups

Check permissions of a folder	`ls -ld foldername`
See all users of a group	`grep groupname /etc/group`
Give a user write permission to a folder using acl	`setfacl -m u:username:rwx foldername`
Change owner group of a folder	`chown -R :groupname foldername`
Change owner user of a folder	`chown username: foldername`
Change permissions of a folder	`chmod -R u+w foldername` / `chmod -R 770 foldername`

sudo adduser username
sudo deluser username
sudo addgroup groupname
sudo delgroup groupname
sudo adduser username groupname
getent passwd | cut -d: -f1
getent group

Storage

sudo mount -t auto /dev/sdb /media/plato/

GPU

sudo apt autoremove nvidia* --purge
sudo /usr/bin/nvidia-uninstall
sudo /usr/local/cuda-X.Y/bin/cuda-uninstall
sudo apt update
sudo apt upgrade
lspci | grep -e VGA
ubuntu-drivers devices
sudo ubuntu-drivers autoinstall
reboot
nvidia-smi

IP setting

ip link
sudo nano /etc/netplan/*.yaml

Create the yaml file the following way:

# This is the network config written by 'subiquity'
network:
  version: 2
  renderer: networkd
  ethernets:
    eno1:
      dhcp4: no
      addresses: [10.50.255.33/27]
      gateway4: 10.50.255.62
      nameservers:
          addresses: [8.8.8.8]
    eno2:
      dhcp4: no
  version: 2

Abekta

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