On Thursday, July 23, 2015 at 2:27:03 AM UTC-5, Ayyanar wrote:
>
> 1." sed -i 's/\$\$HISTORY\$\$/puppet/' /etc/
> system.com "
>
>
> I want to replace a word $$HISTORY$$ with puppet text into /etc/system.com
> file.
>
>
You have to take care to perform proper quoting/escaping for sed, possibly
to quote/escape the result for the shell (only if you are running the
command via the shell), and then to quote/escape *that* result for Puppet.
>From sed's perspective, the program you want to run is
s/$$HISTORY$\$/puppet/
(The '$' is special in a sed pattern only when it appears at the end of the
pattern, or, for GNU sed, at the end of a sub-expression.)
It will save you some trouble to cut the shell out of it, so supposing you
are going to use a Puppet Exec resource to run sed, you should rely on the
'posix' provider (the default where it is available), and avoid the 'shell'
provider.
If you don't need Puppet to interpolate any variables into the command
string (as in your example) then it's not much harder than that:
exec { 'Fill system.com':
command => '/bin/sed -i \'s/$$HISTORY$\\$/puppet/\' /etc/system.com'
}
Note that the backslash you want passed through to sed needs to be escaped
to Puppet. Quoting the whole command string with single quotes prevents
Puppet from interpreting any of the dollar signs as introducing a variable
interpolation. You might not need -- and even might not want -- the
internal single quotes around the sed program, but if you include them then
they must be escaped as shown.
You can trick that out a bit, if you like. Personally, I'd probably do
this:
exec { 'Fill system.com':
command => '/bin/sed -i \'s/$$HISTORY$\\$/puppet/\' /etc/system.com',
onlyif => '/usr/bin/test -e /etc/system.com',
refresh => '/bin/true',
provider => 'posix'
}
Or in truth, if at all possible I would manage the whole file via Puppet.
A Puppet template might be helpful for that, but for the specific example
you provided it would be overkill (no need to use a template to sub a
constant string into a template at run time when you could just edit it
into the master's copy of the file in the first place).
John
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