Calling all experts: Linux and Unix Tips and Tricks

[vl4kn0]

logging on console
My first tip is about logging, especially logging system logs on 11. and 12. console like it is in gentoo. If we are using common linux logger syslog the way is add this lines to /etc/syslog.conf

# Log everything on tty12 
*.*     /dev/tty12 

# Log kernel messages on tty11 
kern.*  /dev/tty11

this lines says that syslog will log system logs to 12. console and all kernel logs to 11. console

Now we need restart syslog

/etc/init.d/syslogd restart

or

/etc/init.d/sysklog restart

it depends on distribution you are used.

we can view the console by pressing alt + F12 for system logs or alt + F11 for kernel logs, if we are in GUI we must press alt + ctrl + F11 or alt + ctrl + F12.
for return to GUI we press alt + F7 becouse default console for GUI is 7 ;)

advanced uninstall packages in slackware
if we want to remove some package on slackware we have to write whole name of package and it removes without asking. i solved this problem with very simple script. here it is:

#!/bin/bash

if [ -z $1 ]; then
        echo "Missing arguments";
        exit 0;
fi

PKG_DIR=/var/log/packages

for ARG in $*; do
        PACKAGES=`ls $PKG_DIR | grep $ARG`;
        for PKG in $PACKAGES; do
                echo "Do you really want to remove $PKG (y|n) ?";
                read ANS;
                case $ANS in
                y) removepkg $PKG > /dev/null;
                   echo "Package $PKG successful removed";
                ;;
                *) echo "Skipping $PKG...";
                ;;
                esac
        done
done

we write this into file for example rempkg, copy this to /usr/sbin and give execute bit.

cp rempkg /usr/sbin/rempkg && chmod +x /usr/sbin/rempkg

console resolulution
My last tip is about freebsd, I hope this topic isn't only for linux :)

I use freebsd but wihout x windows system and I don't like big resolution what is used by default. So I compiled vesa support into the kernel for better resolution.

first step what we need to do is change directory to /usr/src/sys/i386/conf architecture select which you use.

cd /usr/src/sys/i386/conf

then we copy old config to new file.

cp GENERIC VESAKERN

add this line to the new config

options      VESA 
options      SC_PIXEL_MODE

save & exit

change directory to /usr/src and compile new kernel

make buildkernel KERNCONF=VESAKERN 
make installkernel KERNCONF=VESAKERN
reboot

after reboot we can show list of all resolutions by

vidcontrol -i mode

for change resolution run this command

vidcontrol  MODE_<NUMBER OF RESULUTION>

when we are definitely decided for resolution we can change it permanently by editing /etc/rc.conf and adding this lines
allscreens_flag s="MODE_<NUMB ER OF RESOLUTION>"
save & exit & reboot ;)

ps. I'm really sorry for my english but I'm not native english speaker so keep it in mind ;)

REGARDS,
vl4kn0

[mvjohn100]

Run different window managers simultaneously

To run different window managers simultaneously

1) Take a new virtual console ( ctrl + alt + F1/F2/F3)

2) for X server Secession without window manager type "xinit -- :2"

3)from here we can run

a) "startkde" for KDE

b) "gnome-session" for GNOME

[drhowarddrfine]

Most or all of these tips also work in the BSDs

Linux is not BSD Unix or Solaris but they are in the same family and most, if not all, of the tips here will work in those operating systems, too.

[Nepomuk]

Most or all of these tips also work in the BSDs

Linux is not BSD Unix or Solaris but they are in the same family and most, if not all, of the tips here will work in those operating systems, too.

Thanks for that hint, I've changed the subject accordingly.

Greetings,
Nepomuk

[Markus]

Middle Mouse Button Auto-Scroll (Firefox)

I have one for you.

Coming from a long-time Windows background, I was very used to doing middle-button click and drag to scroll much quicker in Firefox. I was disappointed to find that this did not happen in Ubuntu. The fix is simple, though.

Navigate to about:config in Firefox (type that in your address bar, hit enter). Then search for 'autoScroll'. Double clicking the 'general.autoSc roll' entry should change it's value from false to true. If not, you can manually edit it by right clicking the entry and then selecting 'toggle'.

Hey presto, you can now scrub through pages as quickly as you used to do!

[shabinesh]

command line tips with nc and dd

your one line webserver

cat index.html | nc -l 80

to search for phrase from disk and replace back in (check if it works)

dd if=/dev/sda10 | sed 's/aaa/bbb/' | of=/dev/sda10