How to use expect and Bash script together in Same script

sagar666 · 12-07-2014, 10:46 PM

Hi,

I want to use expect and Bash script in same script. How can i use that?

Below is the example what i need actually

-->I want to login server1 (For that i want to use expect script to login machine)
-->Next i wanted to some testing using Bash command
-->Exit from Server1 Machine

Same procedure for Server2,server3 and So on

evo2 · 12-07-2014, 10:59 PM

Hi,

can you explain why you need to use expect to log into the machine?

Are you using ssh? If so, you should use public-key authentication so that you don't need to enter a password for each login.

Regards,

Evo2.

SAbhi · 12-07-2014, 11:42 PM

exactly agreed with evo2..

Expect and send are useful for some testing purpose but not for all, So what you are trying to achieve with this ?

Please show us what have you tried till now ..

sagar666 · 12-08-2014, 12:09 AM

Hi Evo2 and Sabhi,

I am using ssh only. As per your instruction i will use public-key authentication. May i have steps or document to create password less auth using ssh.

Thanks

evo2 · 12-08-2014, 12:43 AM

Hi,

to set it up you need to run "ssh-keygen" on the local machine and then distribute the resulting public key to each of the target machines using "ssh-copy-id server1" for each serverN.

Once you have done the above you'll need to run ssh-add once each session to enter your passphrase. After doing so, for the rest of the session you can ssh to each serverN without using a password. The ssh-add command will connect to the local ssh-agent which will have been automatically started by most modern desktops. Otherwise you can start it manually with:

Code:

eval `ssh-agent`

before running ssh-add.

There are many tutorials online. Post back with questions if you get stuck.

HTH,

Evo2.

lleb · 12-10-2014, 08:47 AM

Quote:

Originally Posted by sagar666

Hi Evo2 and Sabhi,

I am using ssh only. As per your instruction i will use public-key authentication. May i have steps or document to create password less auth using ssh.

Thanks

follow the links in my signatures for HOWTO guides on setting up your ssh keys.

baber · 07-19-2016, 09:04 AM

i have the same problem i want in bash just get a parameter then in expect connect to second server and echo a file with that parameter

when i run just expect work correctly

Code:

#!/usr/bin/expect -f
set timeout 3
spawn ssh  vi-admin@172.20.35.222
expect "password:"
send  "P@ssw0rd6555\r"
expect "$"
send  "echo /usr/lib/vmware-vcli/apps/general/credstore_admin.pl add  >/tmp/96666665.txt\r"
send "exit\r"

expect eof"

but when i write below code not work and get error

Code:

#!/bin/bash
read p
#!/usr/bin/expect -f
set timeout 3
spawn ssh  vi-admin@172.20.35.222
expect "password:"
send  "P@ssw0rd6555\r"
expect "$"
send  "echo /usr/lib/vmware-vcli/apps/general/credstore_admin.pl add $p/tmp/96666665.txt\r"
send "exit\r"

expect eof"

get this error

Code:

./nn.sh: line 5: spawn: command not found
couldn't read file "password:": no such file or directory
./nn.sh: line 7: send: command not found
couldn't read file "$": no such file or directory
./nn.sh: line 9: send: command not found
./nn.sh: line 10: send: command not found
./nn.sh: line 12: unexpected EOF while looking for matching `"'
./nn.sh: line 13: syntax error: unexpected end of file

what do i have to do ?
how can solve this problem?

Best regards

TB0ne · 07-19-2016, 09:22 AM

Quote:

Originally Posted by baber

i have the same problem i want in bash just get a parameter then in expect connect to second server and echo a file with that parameter when i run just expect work correctly

Code:

#!/usr/bin/expect -f
set timeout 3
spawn ssh  vi-admin@172.20.35.222
expect "password:"
send  "P@ssw0rd6555\r"
expect "$"
send  "echo /usr/lib/vmware-vcli/apps/general/credstore_admin.pl add  >/tmp/96666665.txt\r"
send "exit\r"
expect eof"

but when i write below code not work and get error

Code:

#!/bin/bash
read p
#!/usr/bin/expect -f
set timeout 3
spawn ssh  vi-admin@172.20.35.222
expect "password:"
send  "P@ssw0rd6555\r"
expect "$"
send  "echo /usr/lib/vmware-vcli/apps/general/credstore_admin.pl add $p/tmp/96666665.txt\r"
send "exit\r"
expect eof"

get this error

Code:

./nn.sh: line 5: spawn: command not found
couldn't read file "password:": no such file or directory
./nn.sh: line 7: send: command not found
couldn't read file "$": no such file or directory
./nn.sh: line 9: send: command not found
./nn.sh: line 10: send: command not found
./nn.sh: line 12: unexpected EOF while looking for matching `"'
./nn.sh: line 13: syntax error: unexpected end of file

what do i have to do ? how can solve this problem?

Best regards

While this is on topic, it's best not to reopen old threads...visibility is MUCH better if you open your own thread for your own question. Also, please see the "Question Guidelines" link in my posting signature.

That said, there are several example scripts that you can find to do this, just by putting "how to use expect in a bash script", into Google, such as this:
http://sharadchhetri.com/2010/12/07/...n-bash-script/

Again, though, as was said to sagar666 when he opened this thread, you *REALLY* shouldn't do this. It is NEVER, EVER a good idea to hard code a user ID and password into a script...from a security standpoint, it makes the remote machine vulnerable, and you can script much more easily if you do a key swap (as described in this thread), to accomplish what you're after. Once you do the keyswap, read the man page on the ssh command, and pay particular attention to the "-c" flag, which will let you run your command.