ubuntu.md

Ubuntu

List commands

# list commands
ls -lh   # permissions and file size
ls -lah  # permissions and file size on all files
ls -ltrh # permissions and file size, sorted on access time (newest is last)
ls -ld   # permissions, only directories

# directory size
du -sh directory # size in MB

# list recursive file sizes of files and directories in a directory
du --all --human-readable --apparent-size # size in Byte, KB, MB, GB ...

# archives cache size, used to cleaning disk
du -sh /var/cache/apt/archives

# command to get total disk space( free + available )
df -h
df -k

Clean disk space

sudo apt-get clean
sudo apt-get autoclean
sudo apt-get autoremove
du -sh /var/cache/apt/archives

System Information

# default system information with model number
sudo dmidecode | grep -A 9 "System Information"
# or
sudo dmidecode | less

# Through landscape software
sudo apt-get install landscape-common # install
landscape-sysinfo # view

Aliases

# bash profile
code ~/.bash_profile

# copy/paste your public key in terminal
alias public_key="cat ~/.ssh/id_rsa.pub"

# Open ssh config
alias ssh_config="mate ~/.ssh/config"

# Clear app logs(Rails)
alias rc="rake log:clear"
alias rtc="rake tmp:clear"
alias rcc="rake cache:clear"
alias clear_all="rcc ; rc ; echo -e '\033[0;32mlogs cleared.\033[0m' ; rtc ; echo -e '\033[0;32mtmp cleared.\033[0m'"

# perform Rails rake tasks at once
alias rake_all="bundle ; rake db:create ; rake db:migrate ; rake db:seed"

alias workspace="cd ~/Workspace/projects/sample_project"
alias sample_project="workspae ; code ."

# save and exit
source ~/.bash_profile

Build custom command

Make a bin directory in their home directory

mkdir ~/bin 

Put your custom scripts in there

mv command-script ~/bin 

Add this to the bottom of your ~/.bashrc

export PATH=$PATH:~/bin

Log back in and out of your terminal

bash --login

Example

# create bin directory
mkdir ~/bin

# create executable file
sudo vi ~/bin/console

# add your commands to it
## cd /home/apps/vdate/current && bundle exec rails c production

# make the file executable
sudo chmod +x ~/bin/console

# add executable to $PATH
sudo vi ~/.bashrc
## export PATH=$PATH:~/bin

Console color codes

# Black        0;30     Dark Gray     1;30
# Red          0;31     Light Red     1;31
# Green        0;32     Light Green   1;32
# Brown/Orange 0;33     Yellow        1;33
# Blue         0;34     Light Blue    1;34
# Purple       0;35     Light Purple  1;35
# Cyan         0;36     Light Cyan    1;36
# Light Gray   0;37     White         1;37


RED='\033[0;31m'
NC='\033[0m' # No Color
printf "I ${RED}love${NC} Stack Overflow\n"


echo -e '\033[0;32 logs cleared\033[0m'