At Fri, 24 Sep 2010 13:50:11 -0400 CentOS mailing list <centos@xxxxxxxxxx> wrote:
>
> Hello,
>
> I am attempting to grep the contents of a key file I have SCP'd to a
> remote server. I am able to cat it:
>
> [code]
> [bluethundr@LBSD2:~]$:ssh root@sum1 cat /root/id_rsa.pub
> root@xxxxxxxxxxxxxxxxxxxxxxxx's password:
> ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEApnUSYyrM96qIBZKjwSNYycgeSv/FAKE-KEY-DATA--KEY-DATA-PWReyVuOn9Fb/uH/FAKE-KEY-DATA-+ttLzUELGrfn/n+FAKE-KEY-DATA-/FAKE-KEY-DATA-/FAKE-KEY-DATA-/FAKE-KEY-DATA-==
> bluethundr@xxxxxxxxxxxxxxxxxxxxxxxx
> [/code]
>
> But I cannot cat / grep it in order to determine if this key is
> already in the authorized_hosts file of the remote host.
>
> [code]
> [bluethundr@LBSD2:~]$:ssh root@sum1 grep `cat /root/id_rsa.pub`
^ ^
Why the backticks around cat? The above evaluates the *local*
/root/id_rsa.pub, and then passes the result lines as arguments
(filenames) to grep on the remote machine, which of course makes no
sense...
What does the output of
ssh root@sum1 grep `hostname` /root/id_rsa.pub
display? You don't need to cat the file to grep it. Grep does
understand how to use fopen() all by itself, it does not need any help
from cat... :-)
> /root/.ssh/id_rsa.pub
> root@xxxxxxxxxxxxxxxxxxxxxxxx's password:
> /root/.ssh/id_rsa.pub:ssh-rsa ssh-rsa
> AAAAB3NzaC1yc2EAAAABIwAAAQEApnUSYyrM96qIBZKjwSNYycgeSv/FAKE-KEY-DATA--KEY-DATA-PWReyVuOn9Fb/uH/FAKE-KEY-DATA-+ttLzUELGrfn/n+FAKE-KEY-DATA-/FAKE-KEY-DATA-/FAKE-KEY-DATA-/FAKE-KEY-DATA-==
> bluethundr@xxxxxxxxxxxxxxxxxxxxxxxx==: No such file or directory
> grep: root@bt-laptop: No such file or directory
> [/code]
>
> Ultimately, what I would like to do is script this in order to
> automate this process:
>
> [code]
> #!/bin/sh
> HOSTS="sum1 sum2 virt1 virt2 virt3 virt4 virt5 virt6 virt7"
> SSHDIR=~/.ssh
> RSYNC=/usr/local/bin/rsync
> KEYFILE=/home/bluethundr/.ssh/id_rsa.pub
> CAT='/bin/cat'
> GREP='/bin/grep'
>
> for h in $HOSTS ; do
> scp $KEYFILE root@$h:~/
> if [ $? = 0 ]; then
> echo ; echo ; echo
> echo "KEY TRANSFERRED TO $h"
> else
> echo "KEY Transfer To $h has FAILED"
> exit 1
> fi
> ssh root@$h $CAT /root/id_rsa.pub | $GREP -i /root/.ssh/authorized_keys
> if [ $? = 1 ]; then
> ssh root@$h $CAT /root/id_rsa.pub >> /root/.ssh/authorized_keys
> if [ $? = 0 ]; then
> echo ; echo ; echo
> echo "KEY APPENDED TO $h Authorized Hosts"
> else
> echo "KEY APPEND FAILED"
> fi
> exit 1
> fi
> done
> [/code]
>
> This is what results from the above script:
>
> [code]
> [bluethundr@LBSD2:~/bin]$:./key-export.sh
> root@xxxxxxxxxxxxxxxxxxxxxxxx's password:
> id_rsa.pub
> 100% 417
> 0.4KB/s 00:00
>
>
>
> KEY TRANSFERRED TO sum1
> ./key-export.sh: /bin/grep: not found
> root@xxxxxxxxxxxxxxxxxxxxxxxx's password:
> [/code]
>
> And I'm pretty sure I have those variables set correctly in order to
> execute those commands:
>
> [code]
> [bluethundr@LBSD2:~/bin]$:ssh root@sum1
> root@xxxxxxxxxxxxxxxxxxxxxxxx's password:
> Last login: Fri Sep 24 07:34:02 2010 from 192.168.1.44
> #########################################################
> # SUMMITNJHOME.COM #
> # TITLE: LCENT01 BOX #
> # LOCATION: SUMMIT BASEMENT #
> # #
> #########################################################
>
>
> [root@LCENT01:~]#which grep
> /bin/grep
> [root@LCENT01:~]#which cat
> /bin/cat
> [/code]
> _______________________________________________
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> CentOS@xxxxxxxxxx
> http://lists.centos.org/mailman/listinfo/centos
>
>
--
Robert Heller -- Get the Deepwoods Software FireFox Toolbar!
Deepwoods Software -- Linux Installation and Administration
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