Useful bash aliases from http://www.cyberciti.biz/tips/bash-aliases-mac-centos-linux-unix.html

gistfile1.sh

## Colorize the ls output ##
alias ls='ls --color=auto'
 
## Use a long listing format ##
alias ll='ls -la'
 
## Show hidden files ##
alias l.='ls -d .* --color=auto'

## get rid of command not found ##
alias cd..='cd ..'
 
## a quick way to get out of current directory ##
alias ..='cd ..'
alias ...='cd ../../../'
alias ....='cd ../../../../'
alias .....='cd ../../../../'
alias .4='cd ../../../../'
alias .5='cd ../../../../..'

## Colorize the grep command output for ease of use (good for log files)##
alias grep='grep --color=auto'
alias egrep='egrep --color=auto'
alias fgrep='fgrep --color=auto'

## Start calculator with math support
alias bc='bc -l'

## Generate sha1 digest
alias sha1='openssl sha1'

## Create parent directories on demand
alias mkdir='mkdir -pv'

## Colorize diff output
# install  colordiff package :)
alias diff='colordiff'

## Make mount command output pretty and human readable format
alias mount='mount |column -t'

## Command short cuts to save time
alias h='history'
alias j='jobs -l'

alias path='echo -e ${PATH//:/\\n}'
alias now='date +"%T'
alias nowtime=now
alias nowdate='date +"%d-%m-%Y"'