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i want to set massage(Today is) when i type date command.please solve it for me.and please refer me any site for learn more about it.

Hello fahadul!

It sounds like an alias is exactly what you want. Take a look at the alias documentation on TLDP (the linux documentation project):
http://tldp.org/LDP/abs/html/aliases.html

As far as what commands to use, you'll likely want to use "echo" to combine your "Today is" text with the output of "date".

I hope this helps!

Tip: don't make an alias called 'date' and use the command 'date' in it
(you can use the full path /bin/date)

Sounds like a homework...?

Anyway, does it have to be printed just when typing « date », with no arguments?
If so, you'll have to write a function called « date » too in your .bashrc file, in which you'll check whether
there are arguments, and if not, print the string « Today is:<blank> » followed by
the output of the date command. (hint: the keyword command)
If there are arguments, then simply run date(1) with the arguments provided.

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Solution:



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Understanding:

In order:

• Functions ;
• Command Lists ;
• Parameters ;
• Command Substitution ;
• Printf.

I invite you to follow the full BashGuide.
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P.S.: Wooledge >> TLDP.