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Let me explain my situation first. I have an alias in .bashrc:

doscript () { ssh root@server$1 -p2202 "bash -s" < ~/scripts/$2 $3; }

I have a script, that basically consists of several actions like:

check current settings
read comment
do actions
write $comment in a file
restart service

So I run a command

doscript server scriptname parameter

However the "read comment" part does not work. Instead of waiting until I enter the comment, it immediately gets executes, adding nothing to the comment file.

Is there a way to enter variable in that case?

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    when you are launching a non-interactive session, there is no tty assigned to that process. Hence there is no place to read the input from. what you can do is to ssh server "echo \"this is my comment\" > /tmp/commentfile" before you execute your actual script and chage your script to read the comment from the /tmp/commentfile instead of from the tty. Commented May 17, 2016 at 15:00
  • oh, that explains everything. Well, the thing is, I need to view the settings first before I enter the commend as it depends on what I see. I guess I'll need to split the "checksettings" part into a separate script. Thank you! Commented May 17, 2016 at 16:35

1 Answer 1

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The usual way to do this without changing too much is to copy the file to the remote and then execute it, hence keeping stdin available for your tty input. Eg

scp -P 2202 ~/scripts/$2 root@server$1:./myscript
ssh -t root@server$1 -p2202 bash ./myscript $3

or if you cannot scp replace that line by

ssh root@server$1 -p2202 'cat >./myscript' <~/scripts/$2
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  • Copying the script into some temporary folder might be the solution, thank you! Commented May 17, 2016 at 16:38
  • The key is to add -t, +1 for this one Commented May 1, 2023 at 1:51

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