rynmrtn

# Add a user
$ sudo adduser ${user}

# Remove a user
$ sudo deluser ${user}

# Modify the users group
# ${group} is a comma separated list of groups without spaces, e.g. 'group1,group2,group3'
$ sudo usermod -G ${group} ${user}

rynmrtn

# How to resize a logical volume in linux
$ sudo lvm
lvm> lvresize -L +{size}G /vol/location
lvm> lvdisplay

# How to resize a physical volume in linux
$ sudo lvm
lvm> pvresize --setphysicalvolumesize {size}G /vol/location
lvm> pvdisplay

rynmrtn

# Display disk information in linux
df -h

rynmrtn

# List the currently running processes
ps -ef

rynmrtn

# Upload to GitHub
gist < fileWithClipping.ext

# Download from GitHub
gist ${number} > fileToSaveTo.ext

rynmrtn

# calculate the size of a directory in human readable format
du -s -h /directory

# Also
du -h --max-depth=1

rynmrtn

/*
 *  IE Centering Fix: text-align applied to the body of a page in IE6 will
 *    allow the containing divs to be centered (using `margin: 0px auto`). 
 *    We also change the #container to be `text-align: left` because nobody
 *    likes their text being centered.
 */
body {
  text-align: center;
}

rynmrtn

In rails, -%> can remove any newline that follows the output.

rynmrtn

###
# Migrations
# data_types = {:string, :text, :integer, :float, :decimal, :datetime, :timestamp,
#               :time, :date, :binary, :boolean }

# Add a Column
add_column :table_name, :column_name, :data_type, :options

# Remove a Column
remove_column :table_name, :column_name

rynmrtn

# Change VBox UUID
$ VBoxManage internalcommands setvdiuuid diskName.vdi