Add latecommand description

scripts/README.md

@@ -5,6 +5,7 @@
     * [Download Debian](#download_debian.sh)
     * [Download Ubuntu](#dowload_ubuntu.sh)
     * [Make Debian Initrd with Firmware](#make_debian_initrd_with_firmware.sh)
+    * [Late command](#latecommand)
 
 ## Description
 Set of scripts to download and generate necessary files to allow differents GNU/Linux distributions to boot through the network.
@@ -33,3 +34,43 @@ The script will provide Debian's netboot installers with **additionnals firmware
     * myricom : For Myricom Myri-10G Ethernet adapters (IBM server).
     * qlogic : For QLogic Infiniband, SCSI, Fibre Channel/FCoE adapters.
   * Extract initrd and firmwares packages to build a new initrd.
+
+### latecommand
+
+#### Description
+Some useful configurations after a Debian installation :
+  * Smarter rsyslog (more directories and less files in **/var/log**).
+  * Smarter logrotate (add timestamp, move some old log files to the same directory,…).
+  * Remove some useless packages.
+  * …
+
+  * /etc/rsyslog.conf
+    * Shorter configuration file and use more files from /etc/rsyslog.d/
+  * /etc/rsyslog.d/99syslog.conf
+| Logs       | Original path       | New path                           |
+| ---------- | ------------------- | ---------------------------------- |
+| _kern_     | /var/log/kern.log   | __/var/log/kernel/kernel.log__     |
+| _user_     | /var/log/user.log   | __/var/log/security/user.log__     |
+| _mail_     | /var/log/mail.…     | __/var/log/mail/mail.…__           |
+| _daemon_   | /var/log/daemon.log | __/var/log/syslog/daemon.log__     |
+| _auth_     | /var/log/auth.log   | __/var/log/security/auth.log__     |
+| _lpr_      | /var/log/lpr.log    | __/var/log/lpr/lpr.log__           |
+| _cron_     | /var/log/cron.log   | __/var/log/cron/cron.log__         |
+| _localX_   | /var/log/localX.log | __/var/log/syslog/localX.log__     |
+| _syslog_   | /var/log/syslog.log | __/var/log/syslog/syslog.log__     |
+| _authpriv_ | …                   | __/var/log/security/authpriv.log__ |
+
+
+#### How-to use it
+  * First, make an archive of the script and directories :
+```
+tar czvf finish.tar.gz latecommand/
+```
+  * Then, it can be use at the end of a Debian preseed file :
+```
+d-i preseed/late_command string in-target chsh -s /bin/zsh ; \
+in-target /usr/bin/tftp ${IP.SRV.TFTP} -c get ${PATH/TO/TFTPD/ROOT}/finish.tar.gz /tmp/finish.tar.gz ; \
+in-target tar xzf /tmp/finish.tar.gz -C /tmp/ ; \
+in-target /bin/sh /tmp/latecommand/post.sh
+```
+