I got stuck when chmod a file. 

At the bottom of [this page](http://bsc2010.bioinformatics.ucdavis.edu/handson/linux_bootcamp_workshop.html),about "**Scripts**", I did san exercise according to the guide. But en error appeared. Mac OS X, the information on the command line listed below.

```
$ nano myscript
$ chmod 755 myscript
$ myscript
-bash: myscript: command not found

```

I am confused. Could you point out the question? Any responses would be appreciated.
Thank you!