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Thanks this made it easier!

thanks worked perfectly!!

[_@_ ~]$ cat nu
who | wc -l
[_@_ ~]$ ls -l nu
-rwxr-x--- 1 _ _ 11 Jul 30 12:37 nu //the nu is displayed in green color
[_@_ ~]$ nu
bash: nu: command not found

I am using a book from 1986 on...