Eg. 
> 1.Suppose you store some sql comands in a file then you can use input 
> redirection in mysql like this
> $  mysql dbname <sqlcommanfile
> 
> 2. Using you use input redirection in bc. Store the commands in a file and 
> run bc like this
>  
>     $ bc <yourfile

Some more examples:

$ gzip -c </etc/passwd >passwd.gz
  this will compress /etc/passwd file and generates a new compressed
file passwd.gz

$ cat </dev/urandom >/dev/sdb1
  NOTE: DONT TRY THIS UNLESS YOU UNDERSTAND WHAT YOU ARE DOING. This
command will randomize bytes in your USB drive (or second hard drive) so
that data will be thrashed. I think no forensic tool can recover the
data.

Thanks,
Mohan R

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