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Top Forums UNIX for Beginners Questions & Answers Using variables to copy files with increasing numerical names. Post 303044900 by Jovec on Sunday 8th of March 2020 10:04:10 AM
Old 03-08-2020
Using variables to copy files with increasing numerical names.

Hello, I have been learning Linux shell commands for about 4 months now. I am trying to write a simple shell script, but I have encountered an issue I do not understand the cause of.

Code:
#!/bin/bash

first=1
last=10

cp path/to/files/{$first..$last}.dat ./

When I run my script I get an error.
[user@x dir]$ ./myscript.sh
cp: cannot stat `path/to/file/{1..2}.dat': No such file or directory
[user@x dir]$

However when I run it without variables.
Code:
#!/bin/bash

cp path/to/files/{1..10}.dat ./

Running script without variables.
[user@x dir]$ ./myscript.sh

It copies the ten *.dat files from the path/to/files to the directory of myscript.sh. How can I get the script working with variables? Thanks in advance for any help given.
 

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Plack::Session::Store::File(3pm)			User Contributed Perl Documentation			  Plack::Session::Store::File(3pm)

NAME
Plack::Session::Store::File - Basic file-based session store SYNOPSIS
use Plack::Builder; use Plack::Middleware::Session; use Plack::Session::Store::File; my $app = sub { return [ 200, [ 'Content-Type' => 'text/plain' ], [ 'Hello Foo' ] ]; }; builder { enable 'Session', store => Plack::Session::Store::File->new( dir => '/path/to/sessions' ); $app; }; # with custom serializer/deserializer builder { enable 'Session', store => Plack::Session::Store::File->new( dir => '/path/to/sessions', # YAML takes it's args the opposite order serializer => sub { YAML::DumpFile( reverse @_ ) }, deserializer => sub { YAML::LoadFile( @_ ) }, ); $app; }; DESCRIPTION
This implements a basic file based storage for session data. By default it will use Storable to serialize and deserialize the data, but this can be configured easily. This is a subclass of Plack::Session::Store and implements its full interface. METHODS
new ( %params ) The %params can include dir, serializer and deserializer options. It will check to be sure that the dir is writable for you. dir This is the directory to store the session data files in, if nothing is provided then "/tmp" is used. serializer This is a CODE reference that implements the serialization logic. The CODE ref gets two arguments, the $value, which is a HASH reference to be serialized, and the $file_path to save it to. It is not expected to return anything. deserializer This is a CODE reference that implements the deserialization logic. The CODE ref gets one argument, the $file_path to load the data from. It is expected to return a HASH reference. BUGS
All complex software has bugs lurking in it, and this module is no exception. If you find a bug please either email me, or add the bug to cpan-RT. AUTHOR
Stevan Little <stevan.little@iinteractive.com> COPYRIGHT AND LICENSE
Copyright 2009, 2010 Infinity Interactive, Inc. <http://www.iinteractive.com> This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.12.4 2011-07-27 Plack::Session::Store::File(3pm)
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