Bash Shell Temporarily Disable an Alias

I've couple of shell aliases defined in ~/.bashrc file. How do I temporarily remove (disable) a shell alias and call the core command directly without using unalias command?

An alias command enables a replacement of a word with another string. It is mainly used for abbreviating a system command, or for adding default arguments to a regularly used command.

Display currently defined aliases

Type the following command:
$ alias
Sample output:

alias cp='cp -i'
alias dnstop='dnstop -l 5  eth1'
alias grep='grep --color'
alias l.='ls -d .* --color=tty'
alias ll='ls -l --color=tty'
alias ls='ls --color=tty'
alias mv='mv -i'
alias rm='rm -i'
alias update='yum update'
alias updatey='yum -y update'
alias vi='vim'
alias vnstat='vnstat -i eth1'
alias which='alias | /usr/bin/which --tty-only --read-alias --show-dot --show-tilde'
alias vnstat='vnstat -i eth1'

Creating an alias

Create an alias called c for the commonly used clear command, which clear the screen:
$ alias c='clear'
Then, to clear the screen, instead of typing clear, the user would only have to type the letter c and press the [ENTER] key:
$ c

How do I disabled alias temporarily?

An alias can be disabled temporarily and the core command get called directly. Just prefix command with a backslash. Create an alias called vnstat:
$ alias vnstat='vnstat -i eth1'
$ vnstat
Sample output:

Database updated: Fri Mar 13 15:30:01 2009
 eth1
    received:     158.48 GB (20.9%)
 transmitted:     599.82 GB (79.1%)
       total:     758.30 GB
                 rx     |     tx     |  total
 -----------------------+------------+-----------
 yesterday      2.83 GB |   10.90 GB |   13.73 GB
     today      1.92 GB |    7.31 GB |    9.23 GB
 -----------------------+------------+-----------
 estimated      2.97 GB |   11.28 GB |   14.25 GB

Now disabled vnstat alias temporarily, enter:
$ \vnstat
Sample output:

                     rx      /     tx      /    total    /  estimated
 eth1:
     yesterday      2.83 GB  /   10.90 GB  /   13.73 GB
         today      1.92 GB  /    7.31 GB  /    9.23 GB  /   14.24 GB
 eth0:
     yesterday    655.05 MB  /    2.02 GB  /    2.66 GB
         today    438.01 MB  /    1.43 GB  /    1.86 GB  /    2.86 GB