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Top Forums UNIX for Dummies Questions & Answers Purpose of - (hypen) in script or command line Post 302541513 by gwgreen1 on Monday 25th of July 2011 02:14:09 AM
Old 07-25-2011
Bug Purpose of - (hypen) in script or command line

Hi,
I am new for unix and I am following ABS guide. What is the purpose of - (hypen ) in the below command and What it will do in this?. Can anyone explain it in detail. Rest of the things in the below command I understood somewhat.

(cd /source/directory && tar cf - . ) | (cd /dest/directory && tar xpvf -)
 

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Regexp::Common::SEN(3)					User Contributed Perl Documentation				    Regexp::Common::SEN(3)

NAME
Regexp::Common::SEN -- provide regexes for Social-Economical Numbers. SYNOPSIS
use Regexp::Common qw /SEN/; while (<>) { /^$RE{SEN}{USA}{SSN}$/ and print "Social Security Number "; } DESCRIPTION
Please consult the manual of Regexp::Common for a general description of the works of this interface. Do not use this module directly, but load it via Regexp::Common. $RE{SEN}{USA}{SSN}{-sep} Returns a pattern that matches an American Social Security Number (SSN). SSNs consist of three groups of numbers, separated by a hypen ("-"). This pattern only checks for a valid structure, that is, it validates whether a number is valid SSN, was a valid SSN, or maybe a valid SSN in the future. There are almost a billion possible SSNs, and about 400 million are in use, or have been in use. If "-sep=P" is specified, the pattern P is used as the separator between the groups of numbers. Under "-keep" (see Regexp::Common): $1 captures the entire SSN. $2 captures the first group of digits (the area number). $3 captures the second group of digits (the group number). $4 captures the third group of digits (the serial number). SEE ALSO
Regexp::Common for a general description of how to use this interface. AUTHORS
Damian Conway and Abigail. MAINTAINANCE
This package is maintained by Abigail (regexp-common@abigail.be). BUGS AND IRRITATIONS
Bound to be plenty. For a start, there are many common regexes missing. Send them in to regexp-common@abigail.be. LICENSE and COPYRIGHT This software is Copyright (c) 2001 - 2009, Damian Conway and Abigail. This module is free software, and maybe used under any of the following licenses: 1) The Perl Artistic License. See the file COPYRIGHT.AL. 2) The Perl Artistic License 2.0. See the file COPYRIGHT.AL2. 3) The BSD Licence. See the file COPYRIGHT.BSD. 4) The MIT Licence. See the file COPYRIGHT.MIT. perl v5.18.2 2013-03-08 Regexp::Common::SEN(3)
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