Shell script generation command based on template

Question

What I want to achieve

User would provide a command which would do remote execution. Command (protocol for remote execution) can be SSH/RSH... etc. So I want it to be part of a configuration file or a template file (assume parameters are fixed across protocol) like below sample -

template.cfg file (as configured by user):

ssh $ip $commandList

I would generate a list of values in another data file which would contain the ip address and the command list. Like
```
10.182.215.214|echo $UNAME
10.251.142.142|echo $SHELLNAME
```
I would like to have a script call it driver.sh which when executed, generates the actual script/scripts with the command from template to another execution script - execute.sh

Questions

How can I generate the script based on template/plugin (which can take liberty and provide the command)?
If the data is generated in an online application (C/C++), other than normal file based operation (read from the cfg file and update the execute.sh) is there any better way?

Armali · Accepted Answer · 2014-04-07 06:50:06Z

1

1.

while IFS=\| read ip commandList
do  eval echo $(<template.cfg)
done <data >execute.sh

You may want to quote the variable expansions in the data file.

2. Since you want the user-provided command to be part of a configuration file, I see no other way than to read from the cfg file; on the other hand, you may well directly execute the generated commands instead of writing them to an execute.sh.

answered Apr 7, 2014 at 6:50

Armali

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Comments

Henk Langeveld · Accepted Answer · 2012-08-09 22:09:32Z

0

This almost looks as if you're trying to re-implement automated configuration tools like puppet or chef. Beats the ssh loop.

Puppet contains a module called facter, which is used to report/collect all kinds of data about your remote systems.

All of these tools require some setup (public/private keypairs, software installation). They both have the advantage of builtin logging - good for audits.

answered Aug 9, 2012 at 22:09

Henk Langeveld

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