bash how to pass variable to the remote bash script

Question

I have local bash script which is used to invoke a bash script in the remote server and get some reports from remote server.

The way I call this script currently in local_script.sh is:

ssh remoteuse@ip "/bin/bash remote_script.sh"

Now, I want to set a date variable in local_script.sh file and variable needs to available in remote_script.sh files also.

Please give some ideas.

EDIT:

Please see my test script:

[user@localserver]$ ssh remoteusr@ip "/bin/bash remote_script.sh $test_var"

And my remote script:

[user@remoteserver]$ cat remote_script.sh
#!/bin/bash
echo $test_var > test_var.log

But test_var.log file on remote server is empty after running the script

I have noticed you commented on other solutions whether they helped or not. Please take a look at my answer as well, any feedback is welcome :) — PesaThe
– PesaThe, Commented Aug 21, 2018 at 12:40

Prikkeldraad · Accepted Answer · 2018-08-21 10:52:35Z

1

The remote server doesn't know you local variables, you can only pass the value of the variable from local to remote with an extra argument at the ssh line:

ssh remoteuse@ip "/bin/bash remote_script.sh $variable"

answered Aug 21, 2018 at 10:52

Prikkeldraad

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1 Comment

Peter Over a year ago

Thank you for quick reply. I tried the same and not working for me. I have added my test script in post. Please let me know

PesaThe · Accepted Answer · 2018-08-21 11:53:10Z

1

You have to add the variable to the environment of the executed command. That can be done with the var=value cmd syntax.

But since the line you pass to ssh will be evaluated on the remote server, you must ensure the variable is in a format that is reusable as shell input. Two ways come to mind depending on your version of bash:

With bash 4.4 or newer, you can use the Q operator in ${parameter@operator}:

local script:

foo="abc'def  \"123\"  *"
ssh remoteuse@ip "foo=${foo@Q} /bin/bash remote.sh"

remote script:

printf '<%s>\n' "$foo"

output:

$ ./local_script.sh
<abc'def  "123"  *>

If you don't have bash 4.4 or newer, you can use the %q directive to printf:
```
ssh remoteuse@ip "foo=$(printf '%q' "$foo") /bin/bash remote.sh"
```

edited Aug 21, 2018 at 11:53

answered Aug 21, 2018 at 11:33

PesaThe

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