$> convert +append a.png b.jpg c.tif

git checkout -b BRANCH_NAME

http://viget.com/extend/make-remote-files-local-with-ruby-tempfile

backup: # mysqldump -u root -p[root_password] [database_name] > dumpfilename.sql

restore:# mysql -u root -p[root_password] [database_name] < dumpfilename.sql

http://rakeroutes.com/blog/lets-write-a-gem-part-one/

http://rakeroutes.com/blog/lets-write-a-gem-part-two/

SELECT table_schema 'DB Name', 
        round(Sum(data_length + index_length) / 1024 / 1024, 1) 'DB size in MB'
FROM   information_schema.tables 
GROUP  BY table_schema; 

$ cat /etc/passwd

$ rails_apps_composer new myapp -l ~/recipes/

bundle exec sidekiq -e staging -d -L log/sidekiq.log


sidekiq -h

-c, –concurrency INT processor threads to use
-d, –daemon Daemonize process
-e, –environment ENV Application environment
-g, –tag TAG Process tag for procline
-i, –index INT unique process index on this machine
-p, –profile Profile all code ru...

git rm --cached #file_path#

mysql>CREATE DATABASE memcachedSample;
mysql>CREATE USER 'web20'@'localhost' IDENTIFIED BY 'web20';
mysql>GRANT ALL PRIVILEGES ON memcachedSample.* TO 'web20'@'localhost';
mysql>exit;

sudo passwd user_name

split -l num_lines file_name

mongod --dbpath /srv/mongodb/

unicorn_rails -c config/unicorn.rb -D -E staging

-D flag: Start as daemon process (i.e. in background.)
-c flag: config file
-E flag: environment to run in

BASIC:
grep "text string to search” directory-path

EXAMPLE:
$ grep "redeem reward" /home/tom/*.txt

tar -zcvf archive-name.tar.gz directory-name

The resulting .tar.gz file is actually the product of two different things, tar basically just packages a group of files into a single file bundle but doesn’t offer compression on it’s own, thus to compress the tar you’ll want to add the highly effective gzip compression. You can run these as two separate commands if you really want to, but there isn’t much need because the tar command offers the -z flag which lets you automatically gzip the tar file.