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Re: Multiline commands in do shell script
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Re: Multiline commands in do shell script


  • Subject: Re: Multiline commands in do shell script
  • From: Graff <email@hidden>
  • Date: Tue, 03 Feb 2004 15:05:25 -0500

On Feb 3, 2004, at 2:38 PM, John C. Welch wrote:

On 2/3/04 10:59 AM, "Hanaan Rosenthal" <email@hidden> wrote:

Try to separate the different shell commands with a semicolon:

do shell script"command 1;command 2"

Hanaan


So I need to deal with a command that never exits, (mDNS to be precise)
and
do shell script.

Because of the way mDNS works, even if I run it as this:

mDNS -B _ssh._tcp local. > ~/Desktop/mDNSService.txt &

I never return from the do shell script step. What I'd like to do is just
create a three - line shell script and run that, but have it live only in
the script itself...something like

do shell script "#!/bin/sh
mDNS -B _ssh._tcp local. > ~/Desktop/mDNSService.txt &
killall mDNS"

I know there's something stupid I'm missing here, but I can't quite figure
it out.


Nope...command never executes.

This is because in sh (the shell environment that the "do shell script" command uses) you can't have two command separators in a row. Since both & and ; are command separators you get an error.

This gives you an error:
do shell script "command 1 &; command 2"

If you do this instead it should work:
do shell script "command 1 & command 2"

Alternatively you can use csh or tcsh which doesn't have this problem:
do shell script "/bin/csh -c 'command 1 &; command 2'"

- Ken
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References: 
 >Re: Multiline commands in do shell script (From: "John C. Welch" <email@hidden>)

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