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SSH Programatically

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# 1  
Old 04-24-2018
SSH Programatically

Hi Experts,

Need some help.

I am trying below code programatically to login to ssh ip from a csv file.
the below code logging into all servers and executing some command line syntax. But what I need is for example if i have 5 IP's ,if first one connects successfully and executes the commands then i want program to exit if not it has to login into 2nd IP check whether it will be able to access it and issue comands and get me this...

and also the IP have .pem key how would i modify below program to allow ssh with pem key

HOSTS="host1 host2 host3"
SCRIPT="pwd; ls"
for HOSTNAME in ${HOSTS} ; do
    ssh -l ${USERNAME} ${HOSTNAME} "${SCRIPT}"

Moderator's Comments:
Mod Comment
Please wrap all code, files, input & output/errors in CODE tags.
It makes it far easier to read and preserves spaces for indenting or fixed-width data.

Last edited by rbatte1; 04-24-2018 at 11:17 AM.. Reason: Added CODE tags
# 2  
Old 04-24-2018
do it like this...


HOSTS="host1 host2 host3"
SCRIPT="pwd; ls"
for HOSTNAME in ${HOSTS} ; do
ssh -l ${USERNAME} ${HOSTNAME} "${SCRIPT}" && break

&& break causes the shell when the prior command is successful to skip the rest of the loop immediately. Since you do not have any commands after the loop the program is ending then.

  • ${VAR} is no obligation here. $VAR will do too(The first one is 100% syntactically correct too; There are some cases however, when you have to use ${VAR}, e. g. when the following characters would extend the variable name like ${VAR}NAME. Without the braces, this would resolve another - possibly unset - variable named VARNAME)
  • I would avoid overwriting well defined variable Names like HOSTNAME. This variable is reserved for the real hostname of the system. Take any other variable name like "hostname"(lowercase) or "myhost"

Last edited by stomp; 04-24-2018 at 09:59 AM..
This User Gave Thanks to stomp For This Post:
# 3  
Old 04-24-2018
What if host1 and host3 has same password but host2 has different one
# 4  
Old 04-25-2018
The script does not handle passwords. Either the ssh prompts for a password, or an authorized ssh key has been set.

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