Shell Programming and Scripting

I want to create a script that will set up key pairs from "thishost" to "remotehosts". I have a validate script in ~/<dir> that I need to prefix the generated key in the authorized_keys file, and I'm having to manually do this everytime.

Here are my attemps, perhaps you could perfect them for me.

Code:

thishost.pub | ssh user@remotehost "cat >> ~/.ssh/authorized_keys"

- not sure if I can ssh to multiple users@hostname by piping?

I then realised I could save a lot of work using text-processing (especially if we were setting up a lot of keypairs), but I know you will criticise me for being over-complex, and possibly UUOC. :-)

Code:

thishost.pub | ssh rsync@<hostnames> "cat >> ~/.ssh/authorized_keys" awk 'BEGIN {print "command="/home/rsync/cron/validate-rsync" ssh-dss "}{print $0}' validate > <key>.pub

However, this puts the text on a new line, which I don't want. I just want it to prefix the generated text. Would awk or sed be easier for this, and how would I do it over ssh, thus cutting out manual text entry on the remote boxes?

Well, you can do anything you send with ssh. You can send a whole script to ssh host ksh. You can have a list of hosts and ids in a flat file to drive it while read hi do done <file_list. You still need to type in the id unless you wrap the whole thing in expect or the like, to get the password prompt for the controlling terminal back to your script's control. For instance, if you get ssh localhost working without a password, you can

Code:

echo $PASSWD | ssh localhost ssh there command

PS: remove any old as you add new so it is repeatab le without creating duplicates:

Code:

(grep -v 'id'' <file ; echo "$new")>/tmp/new_file;cat /tmp/new_file >file

I understand ScannerDarkly's question, but don't understand DGPickett's reply.

I have same question in fact, but i resolve by manual way.

Code:

scp thishost.pub user@remotehost:~/.ssh/thishost.pub
ssh user@remotehost "cat ~/.ssh/thishost.pub >> ~/.ssh/authorized_keys"
ssh user@remotehost rm ~/.ssh/thishost.pub

If anyone have simply solution by one ssh command, please reply.

As DGPickett says:

Code:

# one way
$ ssh username@host <<EOF
command1
command2
command3
EOF
# another way
$ ssh username@host command1 ';' command2 ';' command3
# yet another way
$ ssh username@host exec /bin/ksh < script.ksh