Howto resize a partition

Command line:
[root]# df -m
[root]# lvm
(starts lvm command line)
Within lvm command line:
lvm> lvdisplay

-- resize swap to 1G
lvm> lvresize /dev/vg_f13v1/lv_swap --size 1G

-- after the operation your LV size is:( LV Size  1.00 GiB)
lvm> lvdisplay

--now add all remaining free space
lvresize -L +1.6GB /dev/vg_f13v1/lv_root

--trigger the resizing process
[root@f13-jon jon]# resize2fs -p /dev/vg_f13v1/lv_root

Writing start scripts for services in Fedora linux

Howto manage your services and programs within Fedora

1. Make your shell script executable

All shell scripts in /usr/bin/ or /sbin/ can be executed anywhere within the command line

Add a softlink into /sbin or /usr/bin

$ cd /sbin

$ ln -s /app/jon/bin/rhq-server.sh jon

$ jon

1.5. Start your shell script at startup by modifying

Example:

$ sudo vi /etc/rc.d/rc.local

add:
killall -9 knetworkmanager & qdbus org.kde.kded /kded unloadModule networkmanagement && nm-applet &

2. Start your program easily via shell script

If you have a shell that takes the standard arguments : start / stop / restart

you can it into the repository /etc/init.d/.

All scripts in /etc/init.d/ can be called with

$ service my_script start

For convenience use a softlink instead of copying it into /etc/init.d:

$ cd /etc/init.d

$ ln -s /app/jon/bin/rhq-server.sh jon

$ service jon start

3. Service registry within Fedora (the startup services)

List all available services (/etc/init.d)

$ chkconfig --list

Start / stop the ssh daemon service

$ chkconfig sshd start (or stop)

Enable a service

$ chkconfig --add ssh

$ chkconfig sshd on

Disable a service

$ chkconfig sshd off

$ chkconfig sshd --del

If you you prefer a graphical interface for the service registry use

$ system-config-services

4. Making an executable 'servicable'

Create a file in /etc/init.d, here an example: shutter 
#!/bin/sh
#
# shutter This script starts and stops the shutter daemon
#
# chkconfig: - 78 30
# processname: shutter
# description: shutter is a daemon process

get_shutter_pid () {
   SHUTTERPID=$( ps aux --cols 1024 | grep "perl" | grep "/usr/bin/shutter" | awk '{ print $2 }' | head -n 1 )
}

PIDFILE=/var/run/shutter.pid

# By default it's all good
RETVAL=0

BASE="/usr/bin"

# See how we were called.
case "$1" in
  start)
    # Start daemon.
    echo -n $"Starting shutter: "
    export DISPLAY=:0
    nohup ${BASE}/shutter > /dev/null &
        sleep 1
        get_shutter_pid
        echo -n ${SHUTTERPID} > ${PIDFILE}
        echo "Start Shutter : pid = ${SHUTTERPID}"
        ;;
  stop)
        # Stop daemons.
        get_shutter_pid
        if ! [ -z "${SHUTTERPID}" ] ; then
           echo "Stop Shutter : pid = ${SHUTTERPID}"
           kill "${SHUTTERPID}"
        fi
        ;;
  restart|force-reload)
        $0 stop
    sleep 8
        $0 start
        ;;
  status)
        get_shutter_pid
        if [ -z "${SHUTTERPID}" ] ; then
            echo "Shutter is stopped"
            exit 1
         else
            echo "Shutter (pid ${SHUTTERPID}) is being executed..."
            exit 0
         fi
    ;;
  *)
    echo "Usage: $0 {start|stop|restart|status}"
    RETVAL=1
    ;;
esac

exit $RETVAL

My useful Linux commands

Some Linux commands I find useful:

Replace a string in all files recursively usind sed ( replaces repository.jboss.com with anonsvn.jboss.org/repos/repository.jboss.org)

grep -rl repository.jboss.com . | xargs sed -i 's/repository.jboss.com/anonsvn.jboss.org\/repos\/repository.jboss.org/'

Add launchers (*.desktop, icon - comment - name) here
/usr/share/applications

Find a file on the file system

updatedb

locate test.xml

Find out which kernel you are using
uname -r

Find string "proxy" in all files
sudo find . -type f -name "*" -exec grep -l "proxy" {} \;

find . -name "*" -exec grep "proxy" {} \;      (donne tous les lignes avec Test_1)

find . -name "*" -exec grep -l "proxy" {} \ ; (donne tous les fichiers avec Test)

grep -r 'proxy' *

Making a script executable
chmod +x

Finding all my files with string "myfile" including soft link references directories
find . -user me -name *myfile* -follow


Displaying directory structure
ls -rtl bbb (-R subdirectories)


Monitoring changes within a file
tail -100 fichier
tail -f file (monitoring)

grep -F ‘abc efg’ (Leerstelle = OR)
grep -i -n (line number) testChar file.txt

grep « VALOTRACE= » `(Alt + Shift + 7) find .`

cat fichier | grep blub
Displays full path of file being executed
which java

grep valopurgesolde.x communs/ces/x (pour voir qu’est-ce que le processus fait)
kill -9 -1 (killt das zuletzt angemeldete Konto)
cd - (go to root)
du -sk . (Wie viel Speicherplatz belegt)
df -k (kilo) . (combien il reste sur le filesystem)
ps -u valqua11  (kill -9 #1 #2)

ln -s link name (ln -s ${HOME}/brackmann roli)
Displaying all exports of the shell
typeset
Process keeps on running in background even when the executing shell is killed
nohup your_command

Gets the 4th columns of the server.log and deletes all the doubles

cat server.log | awk '{ print $4; }' | sort -u > server4thcolumndistinct.log


Deletes all temporary files followed by '~'
find ./ -name '*~' | xargs rm