Abbreviations

Abbreviations:

ARGV: Argument Vector
c(): combine ? not sure

Useful Mac Terminal Commands

Here are some terminal commands which I wish I knew earlier.

1.pushd
pushd and popd are used to store and change directories.
A trick is by using pushd without any parameter, you can
move back and forth between two folders.

a short example
pushd ~/data
pushd ~/analysis
pushd # now the directory is changed to ~/data
pushd # now the directory is changed to ~/analysis

2.clean the screen
This is same as clear command but I prefer to type 2 keystrokes vs 6 keystrokes
In addition, it also works in the console of Rstudio where clear does not.

control + L 

3.screen for ssh connection
When executing a program in a remote computer by ssh,
if the connection lost, the execution will be aborted,
screen command can solve this perfectly.

4.alias for frequently used commands

alias ep="nano ~/.bash_profile"
alias sp="source ~/.bash_profile"
alias cdr="cd ~/Documents/repo/"
alias cdd="cd ~/Dropbox/"
alias ll="ls -Gl"
alias play="~/apps/spotify play"
alias pause="~/apps/spotify pause"
alias n="~/apps/spotify next"
alias p="~/apps/spotify prev"

5.move to the beginning or the end of the line

Control + a # to the beginning
Control + e # to the end 

6.Execute last command as root - sudo !!

A short example - forget to add sudo when install ruby gem
$ gem install gnuplot
Fetching: gnuplot-2.6.2.gem (100%)
ERROR:  While executing gem ... (Gem::FilePermissionError)
        You don't have write permissions for the /Library/Ruby/Gems/2.0.0 directory.

Use sudo !! as a shortcut for sudo gem install gnuplot

$ sudo !!
sudo gem install gnuplot
Fetching: gnuplot-2.6.2.gem (100%)
Successfully installed gnuplot-2.6.2
Parsing documentation for gnuplot-2.6.2
Installing ri documentation for gnuplot-2.6.2

6.Open current directory in Finder from command line

open .

7.Edit bash_profile to enhance the functionality of shell

# change the style and color of the prompt 
PS1='\e[0;32m\u: \e[0;31m\w \e[0;30m'

# add autocomplete for git
if [ -f ~/.git-completion.bash ]; then
   source ~/.git-completion.bash
fi

8.Name the tab

# add a function to bash_profile 
# nt for nametab
function nt {
        echo -ne "\033]1;$1\007"
}

Links

Personal Blogs

• Pluskid


• Mathematica kid


• RIKENer

TextMate Shortcuts

It is super handy to deal with some routine yet trivial tasks with a few TextMate tricks.
Here I list some shortcuts which I found most useful.

Column wise selection
Option + Left Drag with mouse
This allows selection and direct editing on vertical columns.

Auto completion of the code
Esc
In many IDEs, Tab is used for auto completion, similarly you can use Esc key to do this.

Find and Replace in Project Folder
Command + Shift + F
This allows quick replace in a bunch of files inside the same project folder.

Selection of whole line
Control + Command + left Arrow or Right Arrow
Shift + Command + L

Change Indent
Command + [ or ]
This is very useful for Python when there is a block of code need to be indented.

Comment current line
Command + /
If you do Command + / two times, it will uncomment the line. You can also first selected the code block and then comment all together.

clip board history viewer
Control + Option + Command + v

Duplicate current line
Control + Shift + d

Insert Comment Banner
Control + Shift + b

Open Home directory in sidebar
Shift + Command + h

Insert Burdle Item
Control + Command + t

I did a google search during the writing and found a number of great posts and resources:
Essential TextMate Shortcuts, Tips and Techniques
TextMate shortcuts you should be using
PDF version of the TextMate cheat Sheet.