Command Line Tips

Excellent Resource:
https://github.com/0nn0/terminal-mac-cheatsheet/wiki/Terminal-Cheatsheet-for-Mac-(-basics-)

$ Ctrl+A -  to send the cursor to start of the command

$ Ctrl+E - to send the cursor to the end of the command.

$ Ctrl+C - used to quit a running program in terminal

$ Ctrl U - clears the line

$ Ctrl+L - clears the screen while retaining whatever was there on the current prompt

$ Ctrl+R - and write few characters from the start of command you’re looking for

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$ echo <whatever> - reads back in the terminal whatever you write

$ cat <filename> - reads the file

$ touch <filename> - creates a new file

$ head -5 output - displays content from the beginning of a file

$ tail -5 output - displays the last five lines from the file ‘output’

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$ history | grep "myarticle.txt"

$ rm -rf dirname - to force remove a directory and it's contents

$ ! - runs a previously run command

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$ jobs - lists all the commands running in the background !

$ ps - displays a list of the processes you’ve launched

$ fg - bring a specific job back to the foreground

$ kill %<job-number> kills a process by it's job-number in the list or

$ kill<PID> kill a process by is process id (PID) 1234

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sudo lsof -i - "list open files", which is used in many Unix-like systems to report a list of all open files and the processes that opened them. http://danielmiessler.com/study/lsof/

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On a Mac you can 
$ Option + Click - to get to a specific spot in your commandline

For fun:

$ telnet towel.blinkenlights.nl 

http://www.tecmint.com/20-funny-commands-of-linux-or-linux-is-fun-in-terminal/

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http://www.linuxjournal.com/content/time-saving-tricks-command-line

http://www.linuxuser.co.uk/tutorials/14-command-line-tips-tricks

http://mylinuxbook.com/5-really-cool-linux-command-line-tricks/

https://linuxacademy.com/blog/linux/ten-things-i-wish-i-knew-earlier-about-the-linux-command-line-2/

Blank Terminal Window
http://www.cnet.com/news/os-x-terminal-displays-a-blank-window-instead-of-a-command-prompt/

commandline windows pwd

http://www.lemoda.net/windows/windows2unix/windows2unix.html

arp	arp
assign	ln	Create a file link
assign	ln -s	On Unix, a directory may not have multiple links, so instead a symbolic link must be created with ln -s.
assoc	file
at	at batch cron
attrib	chown chmod	Sets ownership on files and directories
cd	cd	On Windows, cd alone prints the current directory, but on Unix cd alone returns the user to his home directory.
cd	pwd	On Windows, cd alone prints the current directory.
chkdsk	fsck	Checks filesystem and repairs filesystem corruption on hard drives.
cls	clear	Clear the terminal screen
copy	cp
date time	date	Date on Unix prints the current date and time. Date and time on Windows print the date and time respectively, and prompt for a new date or time.
del	rm
deltree	rm -r	Recursively deletes entire directory tree
dir	ls	"dir" also works on some versions of Unix.
doskey /h F7 key	history	The Unix history is part of the Bash shell.
edit	vi emacs etc.	edit brings up a simple text editor in Windows. On Unix, the environment variable EDITORshould be set to the user's preferred editor.
exit	exit Control-D	On Unix, pressing the control key and D simultaneously logs the user out of the shell.
explorer	nautilus etc.	The command explorer brings up the file browser on Windows.
fc	diff
find	grep
ftp	ftp
help	man	"help" by itself prints all the commands
hostname	hostname
ipconfig /all	ifconfig -a	The /all option lets you get the MAC address of the Windows PC
mem	top	Shows system status
mkdir	mkdir
more	more less
move	mv
net session	w who
net statistics	uptime
nslookup	nslookup
ping	ping
print	lpr	Send a file to a printer.
reboot shutdown -r	shutdown -r
regedit	edit /etc/*	The Unix equivalent of the Windows registry are the files under /etc and /usr/local/etc. These are edited with a text editor rather than with a special-purpose editing program.
rmdir	rmdir
rmdir /s	rm -r	Windows has a y/n prompt. To get the prompt with Unix, use rm -i. The i means "interactive".
set	env	Set on Windows prints a list of all environment variables. For individual environment variables, set <variable> is the same as echo $<variable> on Unix.
set Path	echo $PATH	Print the value of the environment variable using set in Windows.
shutdown	shutdown	Without an option, the Windows version produces a help message
shutdown -s	shutdown -h	Also need -f option to Windows if logged in remotely
sort	sort
start	&	On Unix, to start a job in the background, use command &. On Windows, the equivalent isstart command. See How to run a Windows command as a background job like Unix ?.
systeminfo	uname -a
tasklist	ps	"tasklist" is not available on some versions of Windows. See also this article on getting a list of processes in Windows using Perl
title	?	In Unix, changing the title of the terminal window is possible but complicated. Search for "change title xterm".
tracert	traceroute
tree	find ls -R	On Windows, use tree | find "string"
type	cat
ver	uname -a
xcopy	cp -R	Recursively copy a directory tree

Nesta - aggregate the posts

This is the blog for my Rails Girls Summer of Code Team The Standard Librarians.

Nesta is a Ruby CMS built with Sinatra. We were originally going to be working in Sinatra for the summer but we switched to working on the Try Ruby Standard library.

I now want to change the year to month.

http://nestacms.com/docs/recipes/adding-links-to-archived-posts

git - change branch to master

We have been preparing our blog to document our progress during RGSoC for what seems like an eternity.

First we wrote and entire blog from scratch in Sinatra. We realized that it really needed a lot of work to acquire all the capabilities that we wanted it to have. Stephanie found Nesta, a ruby CMS built with Sinatra. So we abandoned the work we had done and started on the new blog. It has been a few weeks now and it is almost ready. There are a lot of things you need to manually configure in Nesta.

Last night when we were working on it Steph pushed and broke the blog. I had pulled these changes into my master without realizing it. Luckily I had a branch that still worked properly so I changed that branch into the master and force pushed it with the help of these lovely and helpful directions. 

Thanks again stackoverflow.

http://stackoverflow.com/questions/2763006/change-the-current-branch-to-master-in-git

<=> The Spaceship Operator

Perl was the first language to use <=> the Spaceship Operator.
Groovy is another language that supports it.
So does Ruby!

What does it do?
Instead of returning 1 (true) or 0 (false) depending on whether the arguments are equal or unequal, the spaceship operator will return 1, 0, or −1 depending on the value of the left argument relative to the right argument.

a <=> b :=
  if a < b then return -1
  if a = b then return  0
  if a > b then return  1

It's useful for sorting an array.

http://stackoverflow.com/questions/16600251/how-does-rubys-sort-method-work-with-the-combined-comparison-spaceship-operat

tuple
In mathematics, computer science, linguistics, and philosophy a tuple is an ordered list of elements. In set theory, an -tuple is a sequence of elements, where is a non-negative integer. There is only one 0-tuple, an empty sequence.

Gravatar

Adding a Gravatar to our Nesta Blog Post

from
http://www.markholmberg.com/articles/gravatar-and-ruby-on-rails

The quick and dirty 

There are many configurable options that you can pass into Gravtastic. I found it quite refreshing to have a gem just work "out-of-the-box". It also has support for plain ruby if you're not using something like rails. Also, if you want to have the gravatar load on the client side, it has an option to work using javascript if your using Rails 3.1 or higher. 

Gemfile  

gem 'gravtastic'

Model 

user.rb
include Gravtastic
has_gravatar 

View 

_comment.html.haml
= image_tag @comment.user.gravatar_url

Standard Lib research

big decimal, cmath, coverage, benchmark, csv, cgi, abbrev, base64, curses