FreeBSD good advices:

Flash

FreeBSD + Firefox + flash. It is not really my guide, I just collected some useful ideas into one.

1. Install www/firefox
2. Install www/linux-flashplugin7
3. Install devel/linuxthreads
4. Install www/linuxpluginwrapper
5. Download patch for rtld-elf:
   

   # fetch http://www.jail.se/freebsd/rtld_dlsym_hack.diff
                 

6. Apply the patch:

   # cd /usr/src/libexec/rtld-elf
   patch < /path/to/patch
   
   make
   make install
   make clean
   
                 

7. Create links:

   # cd /usr/local/lib/browser_plugins
   rm libflashplayer.so flashplayer.xpt
   ln -s ../npapi/linux-flashplugin/flashplayer.xpt
   ln -s ../npapi/linux-flashplugin/libflashplayer.so
                 

8. Add the following strings to /etc/libmap.conf:

                 
   
   [/usr/local/lib/npapi/linux-flashplugin/libflashplayer.so]
   libpthread.so.0                 pluginwrapper/flash7.so
   libdl.so.2                      pluginwrapper/flash7.so
   libz.so.1                       libz.so.3
   libstdc++-libc6.2-2.so.3        libstdc++.so.4
   libm.so.6                       libm.so.4
   libc.so.6                       pluginwrapper/flash7.so
                 
               

sysctl

hw.ata.wc=1

I have FreeBSD 6.1 on my HP/Compaq nx9030 laptop. I've copied FreeBSD 6.1 iso file from one partition to another two times:

0: time shown 175 s, mc - 2.74 Mb/s
1: time shown 375 s, mc - 5,51 Mb/s

Please, read ata(4) and tuning(7) for details. This option may be dangerous.
This options should be set before kernel start, i.e. use /boot/loader.conf

kern.corefile=/var/tmp/%N.core

kern.sugid_coredump=1

The first one controls the name of the file. %N is the process name, also available options are %P - PID, %U - UID.
FreeBSD traditionally uses %N.core by default.

Second one says that a process that changes user or group credentials whether real or effective should create a corefile. By default it will not.

Just put this to /etc/sysctl.conf

FreeBSD

autologin

How to make some user login automatically?

1. Add to the /etc/gettytab file the following strings:

   
   test:\
     :al=test:ht:np:sp#115200:
             

   test:\ - entry name, autologin will use this username;
   al=test - autologin username;
   ht - terminal has real tabs;
   np - 8-bit chars;
   (optional) sp#115200 - line speed;
   
   
2. Edit /etc/ttys file:

   
   ttyv0   "/usr/libexec/getty test"         cons25 on  secure
             

   Usual Pc changed with test.

DCOP

ksnapshot

My aim is to take screenshot of a selected region. I'm using ksnapshot which is a part of kdegraphics port, but ksnapshot is too interactive for me ;)
I'd like to have the following steps:

hotkey -> region selection -> save dialog -> quit

After a few minutes I found the following way:

1. Start ksnapshot using dcopstart:

   # setenv pid `dcopstart ksnapshot`
               

2. Send signals using dcop:
   
   Asks ksnapshot to set the grab mode to "Region":

   # dcop $pid interface setGrabMode 2
               

3. Start selection of a region:

   # dcop $pid interface slotGrab
             

4. Save file dialog:

   
   # dcop $pid interface slotSaveAs
               

5. Quit:

   # dcop $pid interface exit
   
               

It's easy to make simple script.