AWK - Moving files

Author

Moving files

Svatoboj

2004-10-03, 8:38 pm

I'm struggling with batch files moving.

I have several files named "file 001.jpg" #contains two blank spaces
or "file 002.jpg" #contains one blank space

I would like to know how to move them using system() in awk.

I can print them:

ls | awk '{print $1"_"$2}'

but how to move them from source to target file?

Svata

Svatoboj

2004-10-04, 8:55 am

ptjm@interlog.com (Patrick TJ McPhee) wrote in message news:<2s8mq4F1hrf51U1@uni-berlin.de>...
>
> And of course in this newsgroup, you made the right choice. You could
> do it all using a Bourne-compatible shell, like this
>
> for a in *
> do
> set -- $a
> mv "$a" $1_$2
> done

Well, there are several approaches to same task. Awk is handy as its
syntax is really space saving.
Sorry, if I date too much, but can you tell me what "set -- $a"
exactly does?

Svata

Ed Morton

2004-10-04, 8:55 am

Svatoboj wrote:
> ptjm@interlog.com (Patrick TJ McPhee) wrote in message news:<2s8mq4F1hrf51U1@uni-berlin.de>...
>
>
>
> Well, there are several approaches to same task. Awk is handy as its
> syntax is really space saving.
> Sorry, if I date too much, but can you tell me what "set -- $a"
> exactly does?

sets the postional parameters $1, etc. to be whatever space-separated
values are stored in $a. For more details, look up the "set" command in
your shells man page (e.g. http://www.rt.com/man/ksh.1.html for ksh).

Ed.

> Svata

Svatoboj

2004-10-05, 8:55 am

Ed Morton <morton@lsupcaemnt.com> wrote in message news:<4OednV5VH8aa2_zcRVn-hA@comcast.com>...
>

> sets the postional parameters $1, etc. to be whatever space-separated
> values are stored in $a. For more details, look up the "set" command in
> your shells man page (e.g. http://www.rt.com/man/ksh.1.html for ksh).

Thank you for your reply. I looked up "set" command in BASH manual
page, but I still don't understand how it works.
>
> Ed.
>
Svata

Chris F.A. Johnson

2004-10-05, 8:55 am

On 2004-10-05, Svatoboj wrote:
> Ed Morton <morton@lsupcaemnt.com> wrote in message news:<4OednV5VH8aa2_zcRVn-hA@comcast.com>...
>
>
> Thank you for your reply. I looked up "set" command in BASH manual
> page, but I still don't understand how it works.

What don't you understand?

There are three functions to set (taken from the bash man page):

1. Without options, the name and value of each shell variable
are displayed in a format that can be reused as input.

2. When options are specified, they set or unset shell
attributes. E.g., set -f, set -x, set +v

3. Any arguments remaining after the options are processed are
treated as values for the positional parameters and are
assigned, in order, to $1, $2, ... $n.

--
Chris F.A. Johnson http://cfaj.freeshell.org/shell
========================================
===========================
My code (if any) in this post is copyright 2004, Chris F.A. Johnson
and may be copied under the terms of the GNU General Public License

Patrick TJ McPhee

2004-10-06, 3:56 am

In article <61792dff.0410050132.7b5a68b8@posting.google.com>,
Svatoboj <svatoboj@centrum.cz> wrote:

% Thank you for your reply. I looked up "set" command in BASH manual
% page, but I still don't understand how it works.

Set allows you to restate the shell's command line. You can set
shell options and replace positional parameters. If you write

set $whatever

the shell expands the shell variable `whatever', then divides it up
using the value of IFS or white space if IFS is not set, and assigns
each piece to a positional parameter. For instance

whatever="a b c"
set $whatever
echo $2

will print `b'. This doesn't work correctly if $whatever has no
value or it begins with - or +. I used -- to say that the rest
of the command line should be assigned to positional parameters.

whatever="-a b c"
set $whatever
echo $2 # prints c
set -- $whatever
echo $2 # prints b
--

Patrick TJ McPhee
East York Canada
ptjm@interlog.com

Svatoboj

2004-10-07, 3:55 am

Ed Morton

2004-10-07, 3:55 am

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