Category Archives: Misc - Page 15

Set up client triggering in WebSphere MQ

Posted by on March 3, 2011 4 comments

Say you want to run a script on a remote machine when the queue is on the server machine. One solution here is to use a client trigger. This means that you run a client trigger monitor on the remote machine. When something lands on the queue on the server the client trigger monitor will run the script on the remote machine. Here is how I set it up

On server:(MQ server installed and configured)

  1. Create a new client channel with chltype(SVRCONN)
  2. Create a new init queue (standard options) – every remote machine needs their own initqueue
  3. Create a process with applicid as it would be if you run the command on the REMOTE machine
  4. Create a new queue with the new init queue and process attached

On the client machine (MQ client installed and configured):

  1. Set the MQSERVER environment variable. Syntax: MQSERVER=’client channel/protocol/adress to server(port)’, eg MQSERVER=’MY.CLIENT.CHANNEL/TCP/192.168.0.1(1414)‘
  2. Check that the remote machine can talk to the server
  3. Start the client trigger monitor ‘runmqtmc -m <qmanager> -q <init queue name>’
    • qmanager – the same you made your new queue on
    • init queue name – the init queue to be used
  4. Done!

Now enable trigger on the queue and watch the magic when messages are pouring in.

Tested on RHEL 3 and WebSphere MQ 5.3

My little regular expression “cheat sheet”

Posted by on February 1, 2011 No comments

Regular expressions kan solve a whole lot of problems but remembering how to build them can be a real pain. This is my own “Cheat sheet” (tested in Vim v7.2)

. = match any wildcard character (must be one and one only)
c.t will match ‘cat’ but not ‘caaaat’ or ‘ct’

+= match 1 or more wildcard characters
ca+t will match ‘cat’, ‘caaat’ but not ‘ct’

* = match 0 or more of the preceeding character
ca*t will match ‘cat’, ‘caaaat’ and ‘ct’

? = match 0 or 1 of the preceding character
ca?t will match ‘cat’ and ‘ct’ but not ‘caaaat’

[] = match a range
[a-z] match all characters from a to z
[blke] match all of the letters b, l, k and e
[^blke] matches all characters EXCEPT b, l, k, and e

| = or character
cat|dog match either the full word ‘cat’ OR ‘dog’

^ = matches beginning of the string
^dog matches the first appearance of ‘dog’ in ‘dog dog dog’. Match is made on each line

$ = matches end of the string
dog$ matches all lines that end with ‘dog’. NOTE Whitespace is also a character!

\ = normal escape character
In Vim the following needs to be escaped to work: +, ?, | and {
A complete list can be found in Vim help ‘:help magic’

{n} = match preceding characters n times
[1-9]{6}-[1-9]{4} matches 771122-5748

{n,m} = match preceding characters between n and m times
‘ca{2,3}t’ will find ‘caat’ and ‘caaat’ but NOT ‘cat’ or ‘caaaat’

My VIM command collection

Posted by on December 20, 2010 No comments

In my work I often need to edit files in a terminal environment. My choice of editor in these environments is VIM. Here are a bunch of commands in command mode that I use.

Start vim

vim <filename>

Start vim with the output of another command/program

<command/program> | vim -

Show vim help

:help

Save file

 :write #or 'w' for short

Quit vim

 :quit #or 'q' for short

Save AND quit

:wq

Force save (you can also force edit and quit by appending a exclamation ‘!’ mark)

:w!

Show line numbers

:set number

Remove line numbers

:set nonumber

Enable syntax highlighting

:syntax on

Disable syntax highlighting

:syntax off

Change colorscheme

:colorsheme <colorscheme> #E.g. desert

Enable auto indent

:set autoindent

Remove auto indent

:set noautoindent

Set tab spaces

:set ts=4 #Sets tab to 4 spaces

Always show status bar (with filename)

:set ls=2

Show special characters

:set list #Use :set nolist to turn off

Delete all lines between X and Y

:X,Yd #X and Y are linenumbers

Load new file into vim. Can also be used to refresh current file – just use ‘e’ without path or filename

:edit /tmp/myfile #or 'e' for short

Run external command. Vim let you run the command, shows the result and switches back to your Vim window again when you press Enter

:! command #E.g. ':! ls' will show the files of your current location

Go to a specific line numer

:<linenumber>

Substitute something with something else in the whole file

:%s/old/new/g

Search for a string in file (next search result = n)

/<search string>

Use regexp

/<regexp>

Undo last action

u

Split window vertically

ctrl + wv

Split window horizontally

ctrl + ws

Create new vertical window

:vnew

Move between windows

ctrl + ww

Rotate windows

ctrl + wr

Diff two outputs from standard input (from command line)

vim -d <(command1) <(command2)

Diff two files inside vim

:e file1 #Open first file
:diffthis #Add window to 'diff pool'
ctrl + wv #Open new window
ctrl + ww #Move to new window
:e file2 #Open second file 
:diffthis #Add window to 'diff pool'
:diff #Execute diff
# Extras
:set diffopt+=iwhite #To ignore whitespaces

If you want to diff two windows (and not open files) just add them to 'diff pool' and run the :diff command

COMMAND MODE OPTIONS
Delete 5 lines
Stand on the first line you want to delete and press 5dd
Delete a whole line
Stand on the line and press: dd
Direct search of word
Stand in the word and press: *
Find matching bracket
Stand on a bracket and press: % (press % again to go back to previous bracket)
Expand all nodes in diff mode
Press: zR
Fold all nodes in diff mode
Press: za