gunzip problem

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LEARN ABOUT DEBIAN

mdm.screen

MDM.SCREEN(1)							   User Commands						     MDM.SCREEN(1)

NAME

       mdm.screen - run a command under mdm-master

SYNOPSIS

       mdm.screen [-c iospec] [-n slaves] command

DESCRIPTION

       mdm.screen runs command under mdm-master so that mdm-run commands in command can run in parallel.

       This program is a part of the Middleman System (mdm).

OPTIONS

       The mdm.screen command has two optional options.

       -c iospec
	      The iospec file (see below).

       -n slaves
	      The number of mdm-slave process to start (default 6).

THE IOSPEC FILE

       mdm-master uses the iospec file to decide whether two commands interfere with each other, and it only runs two commands at the same time if
       they do not interfere.

       Each line of the iospec file specifies the I/O behavior of a program, unless the line starts with a '#' character, in which case  the  line
       is treated as comments and ignored.  The format is as follows:

	      program spec spec ...

       program names the program whose behavior you are specifying.  For each spec element, the first character indicates usage, and the remaining
       characters indicate resource.

       A resource that starts with a '-' character represents the argument of the corresponding program option.   A  resource  that  is  an  empty
       string  represents a program argument.  A resource that is not empty and does not start with a '-' character represents the resource string
       itself.

       A usage is typically an upper-case character.  If two commands access the same resource with different usage, mdm-master will not run these
       two  commands  at  the  same time.  Furthermore, if a command access a resource with 'W' usage, mdm-master will not run it with any command
       that access the same resource in any way (including 'W').  There is a special case: if usage is '0' and resource starts with a '-'  charac-
       ter, it means that the resource program option does not take any arguments.

       All programs has an implicit spec 'Rglobal', so if you mark a program as 'Wglobal', it will not run while any other command is running.

       Here is an example to help clarify matters.  Suppose we have the following iospec file:

	      cc W-o 0-c R
	      rm W

       Then these two commands can run at the same time:

	      cc -o pa pa.o lib.o
	      cc -o pb pb.o lib.o

       These two commands cannot run at the same time:

	      cc -o pa.o -c pa.c
	      cc -o pa pa.o lib.o

       And these two commands also cannot run at the same time:

	      cc -o pa pa.o lib.o
	      rm pa

EXIT STATUS

       The exit status of mdm.screen is 0.

EXAMPLE

       Here is what you do to decompress all files with .gz extension in the current directory tree.

	      mdm.screen find . -iname '*.gz' -exec mdm-run gunzip {} ;

       Since we run find under mdm.screen and invoking gunzip under mdm-run, we specify that we wish to run the gunzip commands in parallel.

SEE ALSO

       mdm-run(1), mdm-sync(1), ncpus(1)

Linux								    2009-03-06							     MDM.SCREEN(1)

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