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Full Discussion: [SOLVED] put dd | ssh command in backgound
Top Forums Shell Programming and Scripting [SOLVED] put dd | ssh command in backgound Post 302703403 by unaligned on Wednesday 19th of September 2012 05:07:11 PM
Old 09-19-2012
[SOLVED] put dd | ssh command in backgound
Greetings,

I have an issue that has baffled me. I have done many searches, read the man documentation, and I have yet to find a solution. I am trying to run the following command within a script to copy a file across servers:

Code:
 
$(dd if="$FDIR" bs=1024 2> /dev/null | ssh "$(whoami)@$SERVER" dd of="$TDIR" bs=1024 2> /dev/null &)

It works, however, this is inside a while loop, and it blocks the loop from executing until the copy is done. The behavior that I want is for no messages from the dd command to show up in the script for the user to see, and I want to be able to run more than one copy (of different files) at a time.

I added the & at the end of the command to try to put it in the background, but it is still blocking the while loop from continuing. I am using ksh on HP-UX.

I was wondering whether anyone has any suggestions?
 

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LEARN ABOUT OSF1

break

break(1)                                                           User Commands                                                          break(1)

NAME

       break, continue - shell built-in functions to escape from or advance within a controlling while, for, foreach, or until  loop

SYNOPSIS

   sh
       break [n]

       continue [n]

   csh
       break

       continue

   ksh
       *break [n]

       *continue [n]

DESCRIPTION

   sh
       The break utility exits from the enclosing for or while loop, if any. If n is specified, break n levels.

       The continue utility resumes the next iteration of the enclosing for or while loop. If n is specified, resume at the n-th enclosing loop.

   csh
       The  break  utility  resumes  execution after the end of the nearest enclosing foreach or while loop. The remaining commands on the current
       line are executed. This allows multilevel breaks to be written as a list of break commands, all on one line.

       The continue utility continues execution of the next iteration of the nearest enclosing while or foreach loop.

   ksh
       The break utility exits from the enclosed for, while, until, or select loop, if any. If n is specified,  then  break  n  levels.  If  n  is
       greater than the number of enclosing loops, the outermost enclosing loop shall be exited.

       The  continue utility resumes the next iteration of the enclosed for, while, until, or select loop. If n is specified then resume at the n-
       th enclosed loop. If n is greater than the number of enclosing loops, the outermost enclosing loop shall be used.

       On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

       1.  Variable assignment lists preceding the command remain in effect when the command completes.

       2.  I/O redirections are processed after variable assignments.

       3.  Errors cause a script that contains them to abort.

       4.  Words that follow a command preceded by ** that are in the format of a variable assignment are expanded with the same rules as a  vari-
           able  assignment.  This means that tilde substitution is performed after the = sign, and also that word splitting and file name genera-
           tion are not performed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), exit(1), ksh(1), sh( 1), attributes(5)

SunOS 5.10                                                          17 Jul 2002                                                           break(1)
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