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From: Andrew DeFaria <Andrew AT DeFaria DOT com>
Subject: Re: Command line arguments
Date: Wed, 31 Oct 2012 13:28:42 -0700
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On 10/31/2012 12:40 PM, David T-G wrote:
> Andrew, et al --
>
> ...and then Andrew DeFaria said...
> %
> % On 10/31/2012 11:23 AM, Brian Wilson wrote:
> ...
> % >${1}, ${2}, etc.  Also, you may want to read up on the getopts command as a
> % >way to process command line arguments.
> % Technically, the {}'s are not needed. You can access them with $1, $2,
> ...
> % "/path/to/$1.save/dir" but not "/path/to/$1save/dir" you'd need the {}
> % (i.e. "/path/to/${1}save/dir" because otherwise the shell would be
> % looking for "1save" as an env variable name.
>
> ... except that environment variables cannot begin with numbers :-)
I was thinking that and should have tested it... Sorry if there was any 
confusion there.
>
>    davidtg AT madi:~ > cat /tmp/numvars.sh
>    bash --version
>    save=x
>    echo $save
>    1save=y
>    echo $1save
>    echo ${1save}
>    davidtg AT madi:~ > bash -x /tmp/numvars.sh
>    + bash --version
>    GNU bash, version 2.05a.0(1)-release (i386-portbld-freebsd4.6)
>    Copyright 2001 Free Software Foundation, Inc.
Interesting bash version there:

    $ bash --version
    GNU bash, version 4.1.10(4)-release (i686-pc-cygwin)
    Copyright (C) 2009 Free Software Foundation, Inc.
    License GPLv3+: GNU GPL version 3 or later
    <http://gnu.org/licenses/gpl.html>

    This is free software; you are free to change and redistribute it.
    There is NO WARRANTY, to the extent permitted by law.

You seem to be a bit behind...
>    + save=x
>    + echo x
>    x
>    + 1save=y
>    /tmp/numvars.sh: 1save=y: command not found
>    + echo save
>    save
>    /tmp/numvars.sh: ${1save}: bad substitution
>
>
> % --
> % Andrew DeFaria <http://defaria.com>
> % Fear has its use but cowardice has none. - Mohandas Gandhi
>
>
> HTH & Happy Hallowe'en
>
> :-D


-- 
Andrew DeFaria <http://defaria.com>
When everything's coming your way, you're in the wrong lane.


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