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[bash] running a function remotely using ssh

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# 1  
Old 02-15-2017
[bash] running a function remotely using ssh
Hi all.

I need a bash script to run a function remotely. I think it should be similar to the following but can't figure out the exact syntax.

Here is the script:
Code:
#!/bin/bash

function nu ()
{
        for var in {0..5}; do printf "$var, "; done; echo
}

ssh host "$(typeset -f); nu"

Here is the output:
Code:
./r.sh 
Badly placed ()'s.
{: Command not found.
for: Command not found.
do: Command not found.
var: Undefined variable.
done: Command not found.

}: Command not found.
nu: Command not found.

Next step is to run it as other user using su command but this is the start.

Thank you in advanced.
Last edited by ziguy; 02-16-2017 at 05:32 AM..
# 2  
Old 02-15-2017
I think you're better off starting with:

Code:
ssh host bash -s << 'EOF'
nu() {
  whatever
}
nu
EOF

This starts a remote shell and reads the script from stdin, which you give with a heredoc
# 3  
Old 02-15-2017
Above seems to work between two systems running bash (or sh) each. What be the shell on the remote system? Do you know if the errors occur on the remote or local host?
# 4  
Old 02-15-2017
Quote:
Originally Posted by ziguy
Hi all.

I need a bash script to run a function remotely. I think it should be similar to the following but can't figure out the exact syntax.

Here is the script:
Code:
#!/bin/bash

function nu ()
{
        for var in {0..5}; do printf "$var, "; done; echo
}

ssh host "$(typeset -f); nu"

Here is the output:
Code:
./r.sh 
Badly placed ()'s.
{: Command not found.
++ null function ++
}: Command not found.
nu: Command not found.

Next step is to run it as other user using su command but this is the start.

Thank you in advanced.
As others have pointed out, setting a function on your system doesn't make the function exist on a remote system.

I'll also point out that $(typeset -f) is run on your local system, before ssh is even run. This is because you've put it inside double quotes, which will evaluate variables, backticks, and $( ) before processing the command.
# 5  
Old 02-15-2017
Thank you for all responses.
Using heredoc is the alternative i'm indeed using right now.

I'm trying to find a better way because I have several functions and need to use them locally AND remotely and don't want to declare the functions more than once.

I'm aware that typeset is evaluated locally, otherwise it won't contain the function and in that case is useless

I'm not sure where the error occurs.
# 6  
Old 02-15-2017
How about:

Code:
. functions.sh

ssh user@host <<EOF
$(cat functions.sh)

remote code
EOF

# 7  
Old 02-15-2017
It works fine for me here, output:

Code:
0, 1, 2, 3, 4, 5,

I expect your remote shell is not a bash shell, if I force csh on remote side:

Code:
#!/bin/bash

function nu ()
{
        for var in {0..5}; do printf "$var, "; done; echo
}

ssh host "csh -c \"$(typeset -f); nu\""

I get a very similar output:

Code:
Badly placed ()'s.
{: Command not found.
for: Command not found.
do: Command not found.


Perhaps you should force bash on remote side with ssh host "/usr/bin/bash -c \"$(typeset -f); nu\""
Last edited by Chubler_XL; 02-15-2017 at 04:31 PM.. Reason: Tidy up grammar
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