UNIX for Dummies Questions & Answers

my source folder is :/tmp/util
of server : pyxis-as2

and target folder is :/apps/prodapp/util/
of server : pyxis-db2

i am trying to do a copy from source to target through SCP

is there any way that I can kick shell script from pyxis-as2 once any single file get loaded into /tmp/util

my scp script is :

Code:

scp -r /tmp/util/*.csv user@pyxis-db2:/apps/prodappl/util/

plus how should i bypass the password into script

any help will be highly appreciated

Do you need to copy them the instant they appear, or is a certain interval OK? For the later, run your command via cron every n minutes. For the former you'll need a script that always runs checking the dir, or hook into the process that puts the file there (eg by watching the FTP transfer log)

As for the authentication bit: don't pass the password along, use public-key authentication instead.

thanks pludi,sorry to little troubling you.

Thanks for advicing for using public-key authentication, I am able to test the public-key authentication.This part i am able to handle. There was step by step process for adding public-key authentication. I am able to do,

I want to do a file transfer as soon as any file get entered into a particular folder.

I am not sure about unix cron program , as I am not a fully unix guys.

My requirement is very simple like a trigger in oracle.

The reason I am looking, as Unix side, application server is located in different box and database in different box. I have built a page (web page) which take the file from user desktop and upload in server in a particular folder. This folder is always fix. Now I have a loader program which requires datafile somewhere in server where DB is there. I could not able to do , and just cheked with DBA they told through scp i can copy, a scp copy scrtipt is working fine , but that requires manual kick-off. This is where I am looking automation, the event should be as soon any file get entered into this folder. If you mention 1 min is requires in cron then I believe it must have options for 1 sec too. But I am not sure , dose Unix handle file transfer or do they have locking.


any input and any thread /insight for cron is highly apprecaited.

It's not quite that simple. A trigger in a RDBMS is executed as soon as it registers a certain event (row update/insert/..., ...). What the RDBMS is for a database is the filesystem for a file, but I know of no system where it can trigger an executable. So you'll have to find a different approach.

One option might be cron. The limitation with cron is that it's resolution is one minute max, meaning your file would be copied with a maximum delay of 1 minute. If that's enough for you, fine, if not we'll have to find something different.

Another option might be to create a small daemon (like sendmail or cron) that watches a certain directory and copies any file that hasn't changed it's size during the last 2 seconds.

Or, third option, you have some kind of log file what registers when a file starts uploading, and when the upload finished. As soon as it's done start the copy process. Basically a variation of the above.

Finally, if your web page can register an finished upload, use it to start the upload via system() or something similar.

As said, do a daemon or cron to watch and update.

Some more suggestions ( not solution ):
1. set up passwordless login,
2. use -B option ensure endless wait does not happens
3. check whether rsync fits for you.
4. follow the ideas by pludi, and implement a system, and get back to us.

if you need for connecting from one server to another server without password, you can use RSA alghorithm.
it use public key and private key. it is secure also.
Good luck.