X1 Question 6

[Charles Stanley]

Hi, I'm out here at the CIS lab working on the extra credit lab and have been make good progress until I got stuck on this. I have tried redirection and piping but can not for the life of me get it to work any help would be great.

Thanks,

Charles

[Robert Lyons]

Try this :

banner "$(date)" > today

[alexa bolas]

Ok. I did try the [i]banner $date[/i] then [i]banner "$date"[/i]
Why does it work [i]banner "$(date)" > today[/i] with the parathesis?
forgetting what the () do.

[Nicholas Gardner]

I also tried banner $date and "$date" with no luck. I think the parenthesis make the date command read like a variable instead of a command, if that makes any sense. I could be completely wrong, but either way thanks for posting the solution.

[chithra mohanavelu]

try this
banner `date` > today

[Nicholas Gardner]

I think[i] banner `date` > today[/i] is what Rich is looking for. I don't fully understand how the banner command works but using `date` puts each part of the date command's output on a new line where as [i]"$(date)"[/i] just reads the first part of the date, cutting off the rest as if the date was "echoed" in. Thanks for the quick response Chithra .

[Jonathan Simms]

Hi,

You can used either banner $(date) or banner `date` because both are valid forms of command substitution although remember that `date` is deprecated in favor of $(date) but either works. So the correct syntax would be [code]$ banner $(date) > today or $ banner `date` > today[/code] but remember that the banner command sees the output of the date command because during command substitution the shell first executes the date command as a sub-shell which passes the output of the date command to banner.

[chithra mohanavelu]

Hi When I use this command I am getting
-bash: $: command not found
am I missing something

[ollie wright]

#!/bin/bash <-------------- This should be the first line of your script. I made the same mistake!

[alexa bolas]

I did not think of putting the command in script form. However, [i]banner 'date'[/i] just displays the word date. [i]banner $(date)[/i] displays Wed Dec 17 13:00:51 PST 2008. It is the latter that I was trying to get at and my understanding of what was being asked.