notes.splitbrain.org

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====== Linux Snippets ======





===== Disable firewall logging to console =====

Edit ''/etc/init.d/klogd'' and set 

<file>
KLOGD="-c 4"
</file>






===== mysqldump Options =====

  #> mysqldump -u user -p --complete-insert --add-drop-table --databases db1 db2

other options

<code>
--no-data
--no-create-info
--no-create-db
</code>

===== Export local webserver to public server =====

  ssh andi@gaz.splitbrain.org -R *:8888:localhost:80
===== Show humanreadable date from timestamp =====

  $> perl -e 'print scalar(localtime(1098189697))."\n";'

===== Swapfile =====

Sometimes you need some swap space. Here is how to add some to a running system:

  # dd if=/dev/zero of=/extraswap bs=1M count=512
  # mkswap /extraswap
  # swapon /extraswap

===== Fedora yum Setup =====

Import GPG keys for installing via yum

  rpm --import /usr/share/rhn/RPM-GPG-KEY-fedora

===== UTF-8 Terminal on an latin1 system =====

Sometimes you need a terminal which can display UTF-8 but your system still uses latin1. Here is what I did:

Install a unicode aware teminal emulator:

  #> apt-get install rxvt-unicode

Make sure you have a UTF-8 locale available eg. ''en_US.utf-8'' (check with ''locale -a''), use ''dpkg --reconfigure locales'' to build one if needed.

Add this to your ''~/.bashrc''

<file>
  alias uterm='LANG=en_US.utf8 urxvt'
</file>

Now run ''uterm'' whenever you need the UTF-8 terminal.


===== Find string in various files =====
<code>
find . | xargs grep 'string' 
</code>

Or if you don't need the flexibility of find:

<code>
grep -R "string" *
</code>

(-R for recursive; the star as a file matching pattern)