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Our Unix server died, so we decided to move our old eLog to the new server, running Mac OSX. Elog version is earlier then 2013, I can not say

I read that on OSX  eLog must be intalled through "make" command

if I need to install eLog first, how to add all old information later?

I found a way to get this to work.  Define a "Messages" logbook for the messages to be broadcast.  None of the user installations need access to it. Use "Execute new = " to execute a script calling the elog command line client passing the message on to each target logbook.  Example:

--- elogd.cfg snippet begin ---

[Messages]

...

Execute new = mass_post.sh $text &

--- elogd.cfg snippet end ---

--- mass_post.sh begin ---

#!/bin/sh

elog -a Sender="System Administrator" -l "Logbook 1" $@

elog -a Sender="System Administrator" -l "Logbook 2" $@

elog -a Sender="System Administrator" -l "Logbook 3" $@

--- mass_post.sh end ---

The $@ expands to all the command line arguments, so the $text field, with all its spaces, gets passed correctly.  Sorry I showed you the example in bash/linux rather than in Windows, but I don't know Windows real well - you're better off translating into it yourself than my untested attempts.  The one thing I can tell you is that the "Execute new" command must include the "background fork".  In Linux this is provided by the & at the end of the line. In windows you'll need to use

Execute new = start "dummy" /min mass_post.bat

to background the process.  This is ESSENTIAL.  Without backgrounding the batch file, the elogd server will go into an infinite loop.  The parent process will wait for the child process to exit before continuing.  elogd is single-threaded, so the child process cannot start until the parent process has completed its current task (which is waiting for the child process to exit). 

You may need to tweak the above a little if you want to pass variable attributes to the script instead of defining them all in the script itself.

 You can pass numerical attributes to an external command via "Execute new =...".  This external command can then do the math and pass the result _back_ to the logbook either as a new entry or as an edit with the command-line client "elog".

For example, given a new entry with (numerical) attributes A and B, if you have

Execute new = add_them.pl $A $B $message id

in your elog.cfg file, then $A and $B will be passed to the add_them.pl perl script.  Now have the perl script (or bc, or whatever you want to use) do the appropriate math and submit the result.  For example, your perl script might include

$C=$A+$B

$D=$A*$B

elog -a C=$C ... -e "$message id" "Sum as edit"

elog -a D=$D ... "Product as new entry"

Is there any way to directly paste an image from a Windows clipboard into an elog entry page?  It's obvious
for uploading a file, but many of my users say that they never make a file, they just want to paste in an image
already onscreen.