Shell Scripting to automate Process of SSH Trust (Password less Login )

RamTeja · 02-07-2014, 04:42 AM

Please spend few min in reading my qsn.
I'm trying to automate process of giving ssh trust (password less login ).
We do have a centralized server and users will login to all other servers from that. As remembering password for 100s of servers is impossible we will provide trust to users i.e. appending id_rsa.pub of user to authorized_keys file of other Server.
I have written a small script
1. Searches the id_rsa.pub file of user.
2. scp the id_rsda.pub of user to other Server's Particular Directory.
3. ssh root@<otherserver>

Let me share my script so that you guys can debug Please Assist me with this :

Script is here and the error i'm getting is below that. I think there is something wrong with EOF block. Rest everything worked fine. Even though i have 24 lines of code I'm getting line 25 : syntax error

#! /bin/bash
read a
read b
read c
if [ -f $a ]
then
echo " $a pub key exists and checking "
if [ "$b" == "vfilvtest" ]
then
echo "can provide trust"
scp $a root@$b:/home/$c/.ssh
ssh root@$b <<EOF
cd /home/$c/.ssh
cat $a >> authorized_keys
exit
EOF
echo "trust is provided"
else
echo "u don't have access"
fi
else
echo "No user pub key"
fi

[root@vf2lvtest testprograms]# ./prog3
user3
vfilvtest
ramat1
./prog3: line 25: syntax error: unexpected end of file

pan64 · 02-07-2014, 05:05 AM

please use [code]here comes your script[/code] to keep formatting.
add set -vx to the beginning of the script:

Code:

#!/bin/bash
set -xv
# you may add here an echo "enter whatever" line
read a
...

and check the result

RamTeja · 02-07-2014, 05:40 AM

Thanks for your quick response. But after adding set -xv, I just error in 26th line instead of 25. No luck at all. Once again I'm mentioning If I remove EOF Block My script is working fine but with that I'm getting an error. My intention to put EOF is it should login to other Host and execute the commands in that particular host. Please Correct me If I'm wrong.

pan64 · 02-07-2014, 05:58 AM

using set -xv you will see the execution of your code line by line. You need to check the last line....

unexpected end of file means an if ... then ... else ... fi or similar construct is not complete. You can try to negate those conditions:

Code:

#original code:
if (ok) then
  some code
else
  some other code
fi

#try this
if (not ok) then
  print error and exit
fi
some code