How to do for loop in single ssh connection

selenanur

I'm trying to pass the parameter from python to shell script. Inside shell script, I need to use the parameter to execute another python script.

What I need is:

1)Inside the shell script I need to get the passed parameter.

2)With a single ssh connection, I need to loop the parameter in for loop. (I don't want to open multiple ssh connection for each word)

3)Inside for loop, I need to execute another python script bypassing the variable as a parameter.

My error: Inside the shell script, I'm not able to loop that variable. Where $i is empty.

What I had tried:

test.py

import subprocess
words = ["abbc", "deef", "ghhi"]

join_word = ' '.join(words)
append_word = '"'+join_word+'"'

ssh_key = #Key
bastion_ip = #ip_address
subprocess.call(["sh", "test.sh",ssh_key, bastion_ip ,append_word])

test.sh

ssh -i $1 ubuntu@$2 -o StrictHostKeyChecking=no << EOF
   echo $3  
   #where $3 contains "abbc deef ghhi"
   for i in $3
   do 
     python3 hello.py $i
   done
EOF

Thanks in advance.

onomatopoeia99

You may wish to try stackoverflow or similar, this isn't really a forum for programming or shell scripting problems.  More a forum for "what is the best gaming laptop for under £50" type questions.

While it's not your problem with the while loop, I'm pretty sure you don't mean the two < in test.sh , HTML entities have no place in a shell script. You could probably use awk to split up $3 with space as a delimiter, and a combination of sed and awk to figure out how many words $3 contains so you have a number to use in a for loop. Or maybe look into foreach .

debitcardmayhem

Ignore ^^ ,

I know you are using &LT&LT to pass << EOT

ssh -i $1 ubuntu@$2 -o StrictHostKeyChecking=no << EOF
   echo $3  
   #where $3 contains "abbc deef ghhi"
   #all vars , cut 3-end , translate space to new-line then read i
   echo $* | cut -d" " -f 3- | tr " " "\n" | while read i
   do
          python3 hello.py $i
   done
EOF

quick and dirty I know but my pi is down at the mo