ammaaim

# To check if a directory exists in a shell script you can use the following:
 
if [ -d "$DIRECTORY" ]; then
# Control will enter here if $DIRECTORY exists.
fi
 
#Or to check if a directory doesn't exist:
 
if [ ! -d "$DIRECTORY" ]; then

ammaaim

// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console

ammaaim

del %windir%\system32\spool\printers\*
net stop spooler
net start spooler

ammaaim

 git push origin --delete <branch-name>

ammaaim

# in excel: file->import->CSV file

require 'csv'

# write csv
CSV.open("file.csv", "wb") do |csv|
  csv << ["row", "of", "CSV", "data"]
  csv << ["another", "row"]
  # ...
end

ammaaim

require 'csv'    

csv_text = File.read('filename.csv')
csv = CSV.parse(csv_text, :headers => true)
csv.each do |row|
  Model.create!(row.to_hash)
end

ammaaim

-- FOR MySQL -disable safemode
SET SQL_SAFE_UPDATES = 0;
-- for example remove all older than '2014-10-01'
DELETE FROM `base-name`.`table-name` WHERE `table-name`.`date-field` < '2014-10-01';

ammaaim

directory_name = "name"
Dir.mkdir(directory_name) unless File.exists?(directory_name)

ammaaim

require 'yaml'

$db_file = 'filename.yaml'

def load_data
  text = File.read 'db.yaml'
  return YAML.load text
end

def store_data hash

ammaaim

The argument mode points to a string beginning with one of the following
 sequences (Additional characters may follow these sequences.):

 ``r''   Open text file for reading.  The stream is positioned at the
         beginning of the file.

 ``r+''  Open for reading and writing.  The stream is positioned at the
         beginning of the file.

 ``w''   Truncate file to zero length or create text file for writing.