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UNIX for Dummies Questions & Answers
Creating a Shortcut in a User Driectory
Post 1610 by Neo on Monday 19th of March 2001 07:59:40 PM
03-19-2001
Administrator
One correct way to communicatin is to say 'create a link'. There are two primary kinds of links, hard links and symbolic links. Directories are normally linked by symbolic links; files by hard links, but not always and YMMV. For example:
Your mail spool directory (located at /usr/spool/mail for example) is always full of big files and filling up your disk partition. You go out to ebay and purchase a 60GB drive for $100 bucks from SuperHardDisks.com. You pay with Paypal and it ships the same day
When it arrives, you have a spare slave port on one of your EIDE channels, so you power down and add the slave device and reboot. The drive is recognized by the BIOS (yippie!), so you run FDISK and create one big 60GB partition (because you get a lot of mail, mostly from spammers offering the fountain of youth and freedom from worries forever!!!).
You then create a directory (normally in the root partition) and then mount the new partition, call it (/usr/spool/supermaildisk). Then you shutdown your mail daemon and move all the mail in /usr/spool/mail to /usr/spool/supermaildisk. Then you remove the /usr/spool/mail directory and create a new symbolic link from /usr/spool/supermail to /usr/spool/mail.
You test to make sure you did not fat-finger any commands and make some goofy error, restart your mail daemon and 'poof!!', you just increased your mail spool directory to many GB.
Perhaps someone else will explain hard links and files, how to use symbolic links for library files, and other exciting fun with links
[Edited by Neo on 03-19-2001 at 08:04 PM]
Your mail spool directory (located at /usr/spool/mail for example) is always full of big files and filling up your disk partition. You go out to ebay and purchase a 60GB drive for $100 bucks from SuperHardDisks.com. You pay with Paypal and it ships the same day
When it arrives, you have a spare slave port on one of your EIDE channels, so you power down and add the slave device and reboot. The drive is recognized by the BIOS (yippie!), so you run FDISK and create one big 60GB partition (because you get a lot of mail, mostly from spammers offering the fountain of youth and freedom from worries forever!!!).
You then create a directory (normally in the root partition) and then mount the new partition, call it (/usr/spool/supermaildisk). Then you shutdown your mail daemon and move all the mail in /usr/spool/mail to /usr/spool/supermaildisk. Then you remove the /usr/spool/mail directory and create a new symbolic link from /usr/spool/supermail to /usr/spool/mail.
You test to make sure you did not fat-finger any commands and make some goofy error, restart your mail daemon and 'poof!!', you just increased your mail spool directory to many GB.
Perhaps someone else will explain hard links and files, how to use symbolic links for library files, and other exciting fun with links
[Edited by Neo on 03-19-2001 at 08:04 PM]
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LEARN ABOUT BSD
crosspost
CROSSPOST(8) System Manager's Manual CROSSPOST(8) NAME
crosspost - create the links for cross posted articles SYNOPSIS
crosspost [ -D dir ] [ -s ] [ file... ] DESCRIPTION
Crosspost reads group and article number data from files or standard input if none are specified. (A single dash in the file list means to read standard input.) It uses this information to create the hard, or symbolic, links for cross posted articles. Crosspost is designed to be used by InterNetNews to create the links as the articles come in. Normally innd creates the links but by having crosspost create the links innd spends less time waiting for disk IO. In this mode one would start innd(8) using the ``-L'' flag. Crosspost expects input in the form: group.name/123 group2.name/456 group3.name/789 with one line per article. Any dots in the input are translated into "/" to translate the news group into a pathname. The first field is assumed to be the name of an existing copy of the article. Crosspost will attempt to link all the subsequent entries to the first using hard links if possible or symbolic links if that fails. By default, crosspost processes its input as an INN channel feed written as a ``WR'' entry in the newsfeeds(5) file, for example: crosspost:*:Tc,Ap,WR:/usr/lib/news/bin/crosspost To process the history file and re-create all the links for all articles use: awk <history -F' ' '(NF > 2){print $3}' | crosspost (where the -F is followed by a tab character.) The ``-D'' flag can be used to specify where the article spool is stored. The default directory is /var/spool/news. By default crosspost will fsync(2) each article after updating the links. The ``-s'' flag can be used to prevent this. HISTORY
Written by Jerry Aguirre <jerry@ATC.Olivetti.Com>. SEE ALSO
newsfeeds(5), innd(8). CROSSPOST(8)