Linux Commands

User Management

• create a user and set password

  • useradd <username> -m -s /bin/bash

  • passwd <username>

• add user to group: gpasswd -a <username> <group>

• change to other user: su - <user_name>

• delete a user with home dir and mail spool: userdel -r <username>

• also see: https://wiki.archlinux.org/index.php/users_and_groups#Other_examples_of_user_management

Hardware

• get info about GPU: lshw -C display

• get infos about CPU: cat /proc/cpuinfo

• get infos about CPU temperature and fans

  • needs package called: lm-sensors

  • the command is sensors

  • also see: https://askubuntu.com/a/15833/478988

• infos about USB: lsusb

• details about USB: lsusb -vvv

Proxy Handling

SSH through a Proxy (to an EC2 instance in this example)

ssh -i <key_file>.pem <user>@<target_host_or_ip> -o "ProxyCommand=nc -X connect -x <proxy_ip>:<proxy_port> %h %p"

SCP through a Proxy (to an EC2 instance in this example)

scp -i ~/.ssh/<key_file>.pem -o "ProxyCommand=nc -X connect -x <proxy_ip>:<proxy_port> %h %p" <file> <user>@<target_host_or_ip>:

Special

• output to terminal and file: command | tee <filename>

Rotate Terminal

• to the right: echo 1 | sudo tee /sys/class/graphics/fbcon/rotate_all

• to the left: echo 3 | sudo tee /sys/class/graphics/fbcon/rotate_all

Administration

• reboot with timer (5 minutes) and message: shutdown -r +5 "<message>"

Bash Aliases

alias ls='ls --color=auto -h'
alias la='ls -lA'
alias ll='ls -l'