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Re: ctrl m question
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Re: ctrl m question


  • Subject: Re: ctrl m question
  • From: "Mark J. Reed" <email@hidden>
  • Date: Fri, 1 Dec 2006 17:35:59 -0500

Note that in the shell, control-M is not actually an EOL.  There's
terminal handling code which does magic to translate it - you hit the
return key, control-M gets sent, but the shell sees control-J instead.
(The same terminal handling code does the control-V stuff).  But
that's only there when you're talking to a terminal - which "do shell
script" isn't.  So you don't need to do anything special with carriage
returns - they're just another character to the shell, and you may
sprinkle them liberally throughout your command strings.

If, on the other hand, you want to send a literal newline  (ASCII
character 10) and not have the shell treat it as "end of command", it
needs to be inside quotation marks or preceded by a backslash.

On 12/1/06, Ian Ward Comfort <email@hidden> wrote:
On Dec 1, 2006, at 2:04 PM, John C. Welch wrote:
> Okay, so to create a ^M for an eol in the shell, you hit ctrl-v
> then ctrl-m.
>
> What would be the best way to represent that in a do shell script
> command,
> as "^M" is just two characters?

The "return" constant in AppleScript is actually ASCII character 13.
So this:

set x to (do shell script "echo " & return & " | cat -v")
display dialog x

pops up a dialog reading ^M on my system.

—IWC

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References: 
 >ctrl m question (From: "John C. Welch" <email@hidden>)
 >Re: ctrl m question (From: Ian Ward Comfort <email@hidden>)

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