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Full Discussion: Help me with mkdir command
Top Forums Shell Programming and Scripting Help me with mkdir command Post 302469735 by Dark2Bright on Monday 8th of November 2010 03:29:17 AM
Old 11-08-2010
Help me with mkdir command
Hi, please help me with this small script

Code:
#!/bin/sh 

curdir=`pwd`
n20=$curdir'/n20/'
msat=$curdir'/n20/msat/'

if [ ! -d $n20 ]
   then
   mkdir $n20
fi

if [ ! -d $msat ]
   then
   mkdir $msat
fi

for a in 30 40 50 60 70 80
do
    $aa=$msat'a'$a
    mkdir $aa
done

The ouput is
Quote:
.../n20/msat/a30: not found
mkdir: missing operand
Try `mkdir --help' for more information.
I don't understand what I am missing.

When I replace "mkdir $aa" with "echo $aa". I get the output like this:
Quote:
.../n20/msat/a30: not found
Why there is 'not found' here? How should I correct it? Could you please explain for me?
 

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LEARN ABOUT OSX

file::spec::functions

File::Spec::Functions(3pm)				 Perl Programmers Reference Guide				File::Spec::Functions(3pm)

NAME

       File::Spec::Functions - portably perform operations on file names

SYNOPSIS

	       use File::Spec::Functions;
	       $x = catfile('a','b');

DESCRIPTION

       This module exports convenience functions for all of the class methods provided by File::Spec.

       For a reference of available functions, please consult File::Spec::Unix, which contains the entire set, and which is inherited by the
       modules for other platforms. For further information, please see File::Spec::Mac, File::Spec::OS2, File::Spec::Win32, or File::Spec::VMS.

   Exports
       The following functions are exported by default.

	       canonpath
	       catdir
	       catfile
	       curdir
	       rootdir
	       updir
	       no_upwards
	       file_name_is_absolute
	       path

       The following functions are exported only by request.

	       devnull
	       tmpdir
	       splitpath
	       splitdir
	       catpath
	       abs2rel
	       rel2abs
	       case_tolerant

       All the functions may be imported using the ":ALL" tag.

COPYRIGHT

       Copyright (c) 2004 by the Perl 5 Porters.  All rights reserved.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

SEE ALSO

       File::Spec, File::Spec::Unix, File::Spec::Mac, File::Spec::OS2, File::Spec::Win32, File::Spec::VMS, ExtUtils::MakeMaker

perl v5.16.2							    2012-10-11						File::Spec::Functions(3pm)
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