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Shell Programming and Scripting

Run yes/no script remotely

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# 1  
Old 02-19-2015
Run yes/no script remotely
I have this script in server2

Code:
[root@server2 ~]# cat /root/yesno.sh
#!/bin/bash

read -p "are you sure?" -n 1 -r

if [[ $REPLY =~ ^[Yy]$ ]]; then
        echo ""
        echo "YES"
else
        echo "NO"
fi


[root@server2 ~]# sh  /root/yesno.sh
are you sure?y
YES

It works fine. I have installed ssh keys between server1 and server2. When I run the script from server1 as follows, it does not prompt the question. However, if I press Y, it gives correct output. How can I get the question printed into the shell?


Code:
[root@server 1~]# ssh root@11.22.33.44   sh  /root/yesno.sh
y

YES

# 2  
Old 02-19-2015
You are using bash features, but running it in sh.

To run it in bash, use bash.
# 3  
Old 02-19-2015
There's a shebang #!/bin/bash in the script, but running it with
sh scriptname bypasses the shebang's effect. The reote script needs to be executable. And run that way.

Code:
# one time only
ssh root@11.22.33.44 ' chmod +x /root/yesno.sh'

ssh root@11.22.33.44 ' /root/yesno.sh'

Also try to keep the remote command surrounded by ' or by " or you will get unexpected results - in general. See the examples above.

PS: root access by ssh is usually a bad idea. If this is a home network, maybe. For business, no. Would not pass a reasonable security audit.
# 4  
Old 02-20-2015
I have modified to /bin/sh and changed script to 755. Still same result. I am using ssh keys between servers.

Code:
# cat /root/yesno.sh
#!/bin/sh


-rwxr-xr-x 1 root root 116 Feb 20 05:17 /root/yesno.sh


#  ssh root@IP /root/yesno.sh
y

YES


#  ssh root@IP   '/root/yesno.sh'
y

YES


# ssh root@IP  "/root/yesno.sh"
y

YES

# 5  
Old 02-20-2015
Try
Code:
ssh -t root@10.1.1.3 ./yesno.sh
are you sure?

# 6  
Old 02-20-2015
Quote:
Originally Posted by anil510
I have modified to /bin/sh and changed script to 755. Still same result.
Before, the problem was that you were accidentally running it in sh when you should have been using bash.

Now, you are intentionally running it in sh when you should be using bash.

If you want bash features like read -p, use bash!
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