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Full Discussion: Executing two commands in parallel
Top Forums Shell Programming and Scripting Executing two commands in parallel Post 302507910 by sharadpisal on Friday 25th of March 2011 06:10:47 AM
Old 03-25-2011
ok .. now there is one more thing we might need to do while doing things in parallel.

suppose there 4 commands
cmd1,cmd2, cmd3, cmd4

goal is :
run cmd1 and cmd2 in parallel, once both are done move on to execute cmd3 and cmd4 in parallel, exit the script once both are done
answer:
_____________
Code:
cmd1 & 
pid1=$!

cmd2 & 
pid2=$!

wait $pid1
wait $pid2

cmd3 & 
pid3=$!

cmd4  & 
pid4=$!

wait $pid3
wait $pid4

_____________
Last edited by Franklin52; 03-25-2011 at 07:15 AM.. Reason: Please use code tags, thank you
 

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LEARN ABOUT DEBIAN

platform::shell

platform::shell(3tcl)					       Tcl Bundled Packages					     platform::shell(3tcl)

__________________________________________________________________________________________________________________________________________________

NAME

       platform::shell - System identification support code and utilities

SYNOPSIS

       package require platform::shell ?1.1.4?

       platform::shell::generic shell
       platform::shell::identify shell
       platform::shell::platform shell
_________________________________________________________________

DESCRIPTION

       The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell.

       This  package  allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only
       requirement is that the other shell (identified by its path), is actually executable on the current machine.

       While for most platform this means that the architecture of the interrogated shell is identical to the architecture of  the  running  shell
       this  is  not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run
       32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers.

       For applications like a code repository it is important to identify the architecture of the shell which will  actually  run  the  installed
       packages, versus the architecture of the shell running the repository software.

COMMANDS

       platform::shell::identify shell
	      This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::generic shell
	      This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::platform shell
	      This command returns the contents of tcl_platform(platform) for the specified Tcl shell.

KEYWORDS

       operating system, cpu architecture, platform, architecture

platform::shell 						       1.1.4						     platform::shell(3tcl)
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