To begin a directory of bash scripts you would like to use regularly (such as trash). You can then add the name of that directory to your $PATH by following the instructions given below. Doing so will allow the scripts therein to be available to you regardless of which directory you are currently working in.

To add a directory to your path, look for a file named .bash_profile in your home directory. It is a bash script that is run automatically when you log in. It should contain a line that defines the variable PATH. Note that the value assigned to this variable is a list of directories, delimited by colons. You can add your new script directory to your path by adding it to the end of this list. (That will cause bash to check your scripts directory after checking the others when search for programs to run.)

please help me to this problem i am really new in ubuntu and about bash..

So I see a lot of information telling you exactly what to do ... what is your question? Do you not know hot to edit a file?

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a little bit..my question is how to code this kind of problem in bash? please help me.. or if you don't want to.. just algorithm ..thanks

it seems to me you want your own 'startup scripts' (like maybe in windows autoexec.bat) ?
It would be easier for one to help if you make a question, not just writing a letter :-)

So where does this original question come from?