Hi
I want to rsync some data from one linux red hat 7.2 system to another, every half an hour.

what is the crontab file where I should make the entry and how should my entry look like?

Let's say, my user is = classy
ip adress of the source pc = 192.150.200.1
file to be picked up = /home/admin/classified


Your suggestions are very much appreciated.

I'm not familiar with rsync so you'll need to write the command yourself (it's just the same command you would normally use to rsync data from the other pc). You don't edit crontab files directly, but rather use the command crontab -e to start editing the file:

Log in as the user who's crontab you wish to edit and run
write and save changes, then exit. Alternatively use root account and run
which should edit crontab for classy.

One line looks like
that should run the given rsync-command (/bin/rsync .... or something) 30 minutes after full hour, every hour, every day of the month, every month and every day of the week, that is, every time clock is xx.30. If you like to run it every 30 minutes you could possibly combine that in one line, but you could just as well copy the line and set the other line be run 00 * * * * which means at full hours, which would result in running it at every 30 minutes. You could also set the first line be run 10 past and the second 40 minutes past, which would again be "every 30 minutes". As you like.

First before you could set this up in a crontab, you'll need to setup ssh keys so it doesn't prompt for a password and never complete the data transfer.

But the rsync command would look something like this if added to b0uncer's cron post above:

rsync -a classy@192.150.200.1:/home/admin/classified /local/dir/to/place/files/to

Hi Thanks so much for your suggestions.
They worked.

Have a good day.