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Readme.md

Ubuntu

  1. Open finder at place from terminal

    xdg-open .

    If the above command doesn't work, then use nautilus or gnome-open in place of xdg-open.

  2. Get External IP

    curl ipecho.net/plain; echo

  3. Test network connectivity

    ping -c 10 www.google.com

  4. Find all sub-directories with name "build"

    find **/build/

    To delete all sub-directories with name "build", replace the command find with rm -rf

  5. Change the default location of where screenshots are saved in Ubuntu

    gsettings set org.gnome.gnome-screenshot auto-save-directory "file:///home/$USER/Pictures/Screenshots"

  6. Set default terminal to Gnome terminal in Ubuntu

    gsettings set org.gnome.desktop.default-applications.terminal exec gnome-terminal

  7. Find out default shell being used in terminal

    echo $SHELL

  8. Make zsh as your default shell in terminal

    chsh -s $(which zsh)

  9. Store the output of a command in a variable

    variable_name=$(command [option ...] arg1 arg2 ...)

    Example:

    To print the current logged in user with headings. execute:

    CURRENT_USER=$(who -H) && echo $CURRENT_USER

  10. Iterate over the output of a command and then run another command on each

    for f in $(command); do echo $f; done

  11. Execute in background any command/script by adding & after a space

    ./myscript &

  12. Bash alias does not directly accept parameters, however, creating an alias that accepts parameters is as simple as creating a function.

    To do this, simply create the function which encapsulates all the commands in order, inside the shell's .rc file i.e ~/.zshrc or ~/.bashrc

    function myFunction(){
    # You can use parameters $1, $2, $3, etc, 
    # or just put them all with $@
    mv "$1" "$1.bak"
    cp "$2" "$2.bak"
}

    Once defined, simply restart your shell by calling exec zsh Now call this function as if it was an alias, since the defined function is available as a command

    myFunction original.txt other.txt

  13. Pass output of one command to another

    command1 | xargs -I{} command2 {}

    Pass output of command1 through xargs using substitution (the braces, {}) to command2.

    For example,

    Execute: echo "Hello" | xargs -I{} echo "{} World"

    Result: Hello World

  14. Check name of your default shell

    echo $0

    You should get the below values:

    • sh: Bourne shell
    • bash: Bourne-Again shell
    • zsh: Z shell
    • ksh: Korn Shell
    • tcsh: TENEX C shell
    • csh: C shell
    • ash: Almquist shell
    • dash: Debian Almquist shell

    [Read more]

  15. Kill all processes that match the name

    # Drop this in your ~/.bashrc or ~/.zshrc file
# Use as: killAllProcesses chrome
#      where 'chrome' is the name of the process
#
# To get the name of the process run: ps -A
function killAllProcesses(){
    for f in $(pgrep "$1"); 
    do 
        echo "💀 Killing PID $f"
        kill -9 $f; 
    done
}

  16. Check the name of your default os

    echo $OSTYPE

    You should get the below values:

    • linux-gnu: GNU Linux
    • darwin: Mac OSX
    • cygwin: POSIX compatibility layer and Linux environment emulation for Windows (Cygwin)
    • msys: Lightweight shell and GNU utilities compiled for Windows (part of MinGW, on Windows for Git Bash/msysGit)
    • freebsd: FreeBSD

    Bonus

    If you would like to execute a command based on which OS your shell is running on, use below:

    if [[ "$OSTYPE" == "linux-gnu" ]]; then
    # ...
elif [[ "$OSTYPE" == "darwin"* ]]; then
    # Mac OSX
elif [[ "$OSTYPE" == "cygwin" ]]; then
    # POSIX compatibility layer and Linux environment emulation for Windows
elif [[ "$OSTYPE" == "msys" ]]; then
    # Lightweight shell and GNU utilities compiled for Windows (part of MinGW)
elif [[ "$OSTYPE" == "freebsd"* ]]; then
    #FreeBSD
else
    # Unknown.
fi

    Also checkout the config.guess shell script that is more concrete script.

Aliases

How to setup these aliases

  • Copy-Paste these alias inside your .bashrc or .zshrc
  • Save.
  • Goto terminal and execute source ~/.bashrc or source ~/.zshrc.
  • Done, now simply call the alias to execute the command as defined.
# ------------------ Misc ------------------ #
# Get rid of command not found
alias cd..='cd ../'
# Quick way to get out of current directory
alias ..='cd ../'
alias .='cd ./'

# Make mount command output pretty and human readable format
alias mount='mount |column -t'

# Print the Path variable value
alias path='echo -e ${PATH//:/\\n}'

# Print current time/date
alias now='date "+%c"'
alias nowtime='date +"%T"'
alias nowdate='date +"%d-%m-%Y"'

# Play video files in a current directory
alias playMpg='mplayer *.mpg'
alias vlc='vlc *.mpg'
 
# Play all music files from the current directory
alias playmp3='for i in *.mp3; do mplayer "$i"; done'
 
# Shuffle mp3/ogg etc by default
alias music='mplayer --shuffle *'

# Get system memory, cpu usage, and gpu memory info quickly
alias meminfo='free -m -l -t'
 
# Get top process eating memory
alias psmem='ps auxf | sort -nr -k 4'
alias psmem10='ps auxf | sort -nr -k 4 | head -10'
 
# Get top process eating CPU
alias pscpu='ps auxf | sort -nr -k 3'
alias pscpu10='ps auxf | sort -nr -k 3 | head -10'
 
# Get CPU info
alias cpuinfo='lscpu'

# Download MP3 using youtube-dl utility
alias downloadmp3='youtube-dl --extract-audio --audio-format mp3'

# Get external IP
alias externalIP='curl ipecho.net/plain; echo'

# Ping to check network connectivity
alias pingNetwork='ping -c 10 www.google.com'

# Micro Terminal Editor
# Install micro from: https://github.com/zyedidia/micro
alias micro="~/micro"

# -------------- GREP Tool Config --------- #

# Enable colored output in grep and similar tools
alias grep="grep --color=auto"
alias fgrep="fgrep --color=auto"
alias egrep="egrep --color=auto"

# Set color as per the table
# 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
# This sets the color to blue for output of grep
export GREP_COLOR='1;34'

# ------------------ Shell ---------------- #
# Get default/current shell name
function currentShell(){
  local CURRENT_SHELL_NAME=$SHELL;

  if [[ "$CURRENT_SHELL_NAME" == "-"* ]]; then
    # Returned name is of type: -bash
    # Sanitize the result by removing "-"
    CURRENT_SHELL_NAME=$(echo $CURRENT_SHELL_NAME | cut -d '-' -f 2);
  fi

  if [[ "$CURRENT_SHELL_NAME" == "/usr/bin/"* ]]; then
    # Returned name is of type: /usr/bin/bash
    # Sanitize the result by removing "/usr/bin/"
    CURRENT_SHELL_NAME=$(echo $CURRENT_SHELL_NAME | awk -F'/' '{print $4}');
  fi

  if [[ "$CURRENT_SHELL_NAME" == "/bin/"* ]]; then
    # Returned name is of type: /bin/bash
    # Sanitize the result by removing "/bin/"
    CURRENT_SHELL_NAME=$(echo $CURRENT_SHELL_NAME | awk -F'/' '{print $3}');
  fi

  echo $CURRENT_SHELL_NAME;  
}

# Reset/Reload your current/default shell 
alias resetTerminal="exec $(currentShell)"

# Open the default shell's rc file for defining configuration 
alias shellConfig="code ~/.$(currentShell)rc"

# ------------------ SSH ------------------ #
# More info at : https://help.github.com/articles/generating-ssh-keys/
export SSH_KEY_PATH="~/.ssh/rsa_id"
alias getsshkey='cat ~/.ssh/id_rsa.pub'


# ------------------ PATH ------------------ #PATH="$PATH:$FLUTTER_SDK:$DART_SDK"

# Setup JAVA_HOME
if [[ "$OSTYPE" == "linux-gnu" ]]; then
    # Linux
    export JAVA_HOME="$(jrunscript -e 'java.lang.System.out.println(java.lang.System.getProperty("java.home"));')"
elif [[ "$OSTYPE" == "darwin"* ]]; then
    # Mac OSX
    export JAVA_HOME="/Library/Java/Home"
fi

# Setup OS specific aliases/Paths
if [[ "$OSTYPE" == "linux-gnu" ]]; then
  # Linux
  # ------------------ Ubuntu ---------------- #
  alias logout="gnome-session-quit"
  alias shutdown='dbus-send --system --print-reply --dest=org.freedesktop.login1 /org/freedesktop/login1 "org.freedesktop.login1.Manager.PowerOff" boolean:true'
  alias lock="gnome-screensaver-command -l"
  alias hibernate="sudo pm-hibernate"
  alias editGRUB="sudo gedit /etc/default/grub"
  alias updateGRUB="sudo update-grub"
  alias updateAllPackages='sudo apt autoclean && sudo apt autoremove && sudo apt full-upgrade'

  # Open command equivalent When using linux:
  #     - GNOME, use 'gnome-open'
  #     - Budgie, use 'nautilus'
  #     - any other if you have a different DE and finder application
  alias defaultFinderApplication="nautilus"

  # Open function to open the Nautilus Finder GUI from terminal by passing the path
  # Use as: open ./ 
  function open(){
    PASSED_PATH=$1

    # Validate the passed path. If it is empty or just '.'
    # Then translate to './' for current directory
    
    if [ -z "$PASSED_PATH" ]; then
      # Empty paramter, translate to './'
      PASSED_PATH="./"
    fi

    if [[ "$PASSED_PATH" == "." ]]; then
      # String has only '.', translate to './'
      PASSED_PATH="./"
    fi
    
    if $(xdg-open $PASSED_PATH); then
      # Default finder application was found and 
      # the command completed successfully
    else
      # Default finder application was NOT found
      # switch to using user specified finderapplication command
        # nohup : Used to but the command in background and detach from current terminal
      # nautilus: Finder application for Ubuntu
      #
      # 1>/dev/null 2>&1 : No output when executing
      # - `1>/dev/null` redirects standard output (1) to /dev/null, which discards it.
      # - `2>&1` redirects standard error (2) to standard output (1), 
      #   which then discards it as well since standard output has already been redirected.
      nohup $(defaultFinderApplication) "$PASSED_PATH" 1>/dev/null 2>&1 ;
    fi
  }

  # ------------------ Budgie DE ---------------- #
  alias resetBudgiePanelConfig="budgie-panel --reset --replace &!"
  alias restartBudgie="nohup budgie-panel --replace&"
elif [[ "$OSTYPE" == "darwin"* ]]; then
  # ------------------ Mac OSX ------------------ #

  # Setup PATH variable
  SBIN_PATH="/usr/local/sbin"
  RBENV_PATH="$HOME/.rbenv/bin"
  export PATH="$SBIN_PATH:$RBENV_PATH:$PATH"

  # Brew update and cleanup
  alias updateAllPackages='brew update && brew upgrade && brew cleanup && brew doctor'
fi

# Use as: createBashScript my_script
function createBashScript(){
    local SCRIPT_NAME="$1".sh
    touch $SCRIPT_NAME
    echo "#!/usr/bin/env bash" > $SCRIPT_NAME
    echo 'echo Hello World' >> $SCRIPT_NAME
    chmod +x $SCRIPT_NAME
    code $SCRIPT_NAME
}

# ---------------Enable syntax highlighting in zsh------------------#
# 
# To set it up, make sure the script exist in home directory
#  cd ~ && git clone https://github.com/zsh-users/zsh-syntax-highlighting.git
# 
# NOTE: The source command must be at the end of ~/.zshrc.
# 
# Read More: https://github.com/zsh-users/zsh-syntax-highlighting/blob/master/INSTALL.md
source ~/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh

Scripts

  1. fix_hibernate_ubuntu: Fix hibernation issue in Ubuntu OS
  2. color_graph: Display a nice color bar chart in terminal
  3. autoscript: Automate the bash script creation process via a simple command.

License

Copyright 2016 Nishant Srivastava

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.