Month: January 2010

Allow not compatible extension in firefox 3.6

When upgrading firefox, I cannot use extension which have not been flagged as compatible with the new version yet (open book for example).

Just add an entry in the about:config page to let firefox run it (at your own risks )
Add a boolean entry:

extensions.checkCompatibility.3.6

and set it to

false

The syntax evlolved since firefox 3.6 (the version number was not mentionned explicitly before).
Refer to http://le-moulin-de-verre.com/fieldnotes/?p=111 for firefox prior to 3.6.

Mozilla reference: http://kb.mozillazine.org/Extensions.checkCompatibility

Monitoring EJB’s inside Glassfish V2

Interresting ressources regarding EJB monitoring in Glassfish 2.1.1:

http://docs.sun.com/app/docs/doc/820-4335/ablur?a=view

http://dlc.sun.com/pdf/820-4343/820-4343.pdf

KSH vi mode (auto complete)

Daily, I log into unix servers where the only installed shell is KSH.
I really miss the the auto-completion provided by the ‘tab’ key of BASH shells.

Something similar can be activated on KSH, by setting it to to the so called ‘VI’ mode.

set -o vi

in your .profile or .login scripts.
You can now enjoy the vi editor commands (and more) right from the command prompt.

To envoke the editor, simply hit the ESC key. Just like going from input mode to command mode inside of vi. Some of the more useful key strokes:

ESC+\ = autocomplete, will complete upto the non-unique character.
ESC+* = space delimited list of all files that match the pattern you started with.
ESC+/str = search the commandline history for str.
ESC+n = search for the next occurance of str.
ESC+k = go back one in the commandline history.
ESC+j = go forward one in the commandline history.
ESC+$ = go to the end of the current line
ESC+0 = go to the beginning of the current line
ESC+i = return to insert mode
ESC+A = append to the end of the current line
ESC+I = insert from the beginning of the current line
ESC+fx = move cursor to the right until the next occurance of x
ESC+Fx = move cursor to the left until the next occurance of x
ESC+x = delete character under cursor and place it in the buffer
ESC+p = place the contents of the buffer after the cursor
(combining the last two keystrokes)
ESC+xp = transpose two characters (I use this alot)

Allow connection sshd from other hosts

I set up an SSH server using Cygwin on windows. I was able to test it localy (ssh myAccount@localhost) but I encountered an error when trying from a distant machine.

ssh_exchange_identification: Connection closed by remote host

We have to allow connection from a distant machine inside /etc/hosts.allow on the server.
The syntax of this file is

<services separated by coma>:<hosts or IP separated by coma>[:command]

where command is the command to execute on a connection attempt

So I remove the PARANOID deny from the allow file (!?) and explicitly logged connection attempts from ssh.

# hosts.allow   This file describes the names of the hosts which are
#               allowed to use the local INET services, as decided
#               by the '/usr/sbin/tcpd' server.
#
ALL : localhost 127.0.0.1/32 [::1]/128 : allow
ALL : PARANOID : deny
sshd: ALL
# hosts.allow   This file describes the names of the hosts which are
#               allowed to use the local INET services, as decided
#               by the '/usr/sbin/tcpd' server.
#
ALL : localhost 127.0.0.1/32 [::1]/128 : allow
# sshd: ALL
# same directive while keeping track of attemps
shd: ALL: spawn (echo "Attempt from %h %a to %d at `date` by %u" | tee -a /var/log/sshd.log)