07-25-2011
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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LEARN ABOUT DEBIAN
update-rcconf-guide
UPDATE-RCCONF-GUIDE(8) Debian GNU/Linux UPDATE-RCCONF-GUIDE(8)
NAME
update-rcconf-guide - Create default guide file for rcconf
SYNOPSIS
update-rcconf-guide
DESCRIPTION
Update-rcconf-guide creates the default guide file which rcconf uses.
Update-rcconf-guide searches the package names corresponding to each service file in /etc/init.d directory from dpkg info
files(/var/lib/dpkg/info/*.list) and get the description of these packages using apt-cache. Update-rcconf-guide uses Short-Description in
priority to the description if service files has Short-Description field. Update-rcconf-guide writes those results to
/var/lib/rcconf/guide.default file.
You can write your own guide in user guide file(/var/lib/rcconf/guide) by hand. Rcconf refers Guides in /var/lib/rcconf/guide before those
in /var/lib/rcconf/guide.default.
If you install some packages after executed update-rcconf-guide, you need to re-create this file using update-rcconf-guide so as to refresh
guide.default that includes new guides for installed new services.
Notice: update-rcconf-guide was not executed when you installed rcconf
package.
FILE
/var/lib/rcconf/guide.default
Guide File update-rcconf-guide generates.
/var/lib/rcconf/guide
Guide File user(Administrator) can define.
SEE ALSO
rcconf(8)
AUTHOR
Atsushi KAMOSHIDA <kamop@debian.org>
perl v5.10.1 2009-01-21 UPDATE-RCCONF-GUIDE(8)