vim remove duplicate lines

g/^\(.*\)$\n\1/d

TR (bash)

Can use tr to remove all carriage returns and Ctrl-z ( ^Z ) characters from a Windows file by entering:

tr -d '\15\32' < winfile.txt > unixfile.txt

tr '\r' '\n' < web_to_print_compare-edited.csv > unixfile.csv


Note: cannot use tr to convert a document from Unix format to Windows

sort and remove duplicates in file

sort and uniq will quickly and easily remove duplicates, lsit only the dupilcates or only the unique data.

sort myfile.txt | uniq

Metaphone or Double Metaphone

Methaphone / Double Metaphone is an algorithm to match words that are spelled differently, but sound the same. Its useful for avoiding duplicated names in a database.

VIM helpful commands

:sort u (remove duplicate line)
:g/pattern/d (delete line)
:g/^$/d (delete blank lines)
:%s/.*/\U&/ (UPPER CASE)
:%s/.*/\L&/ (LOWER CASE)

same origin policy

Aa web page served from domain1.com CANNOT normally connect to or communicate with a server other than domain1.com

POST

• POST is safer than GET


• No restrictions in size


• No Format restrictions. Binary data is also allowed.


• The browser ussually alerts the user that data need to be resubmitted.


• multipart/form-data or application/x-www-form-urlencoded

GET

• GET is less secure compared to POST


• Data in the URL and URL length is restricted


• GET requests are re-executed (Back button/re-submit behavior)


• Only ASCII characters allowed


• application/x-www-form-urlencoded

lads

a male person of any age between early boyhood and maturity.
Dicrionary: Lads

ergo

A Latin word meaning "therefore." In logic, ergo means the conclusion of a preceding argument.