Need command line to run a file 4 times

[jackster the jackle]

Hi Ruby Forum...

I have a script that I run every minute in cron to gather SNMP
statistics and put them in a DB.

Since CRON only goes down to one minute intervals and I'd rather not
change my code to loop so that I can poll every 15 seconds, is there a
way to run a ruby file from the command line and tell it to run the file
4 times?

something like this (which I know doesn't work)

do /usr/bin/SnmpPoll.rb * (4)

Thanks

jackster

http://jackster.mobi

 

[Xavier Noria]

Since CRON only goes down to one minute intervals and I'd rather not
change my code to loop so that I can poll every 15 seconds, is there a
way to run a ruby file from the command line and tell it to run the
file
4 times?

You mean something like this?

$ for x in 1 2 3 4; do echo $x; done
1
2
3
4

-- fxn

 

[jackster the jackle]

You mean something like this?

$ for x in 1 2 3 4; do echo $x; done
1
2
3
4

-- fxn

Not exactly Xavier. I have a file (/usr/bin/snmp_poller.rb), when it
runs, it polls a network device and stores the SNMP data in the DB. I
currently have this running in CRON every minute. Without putting a loop
in my snmp_poller.rb code, I want to somehow tell CRON using a ruby
command line option, to run snmp_poller.rb 4 times.

I know there are a lot of command line, one liners to run ruby code and
I was hoping someone had one to do this.

thanks

jackster.mobi

 

[Xavier Noria]

Not exactly Xavier. I have a file (/usr/bin/snmp_poller.rb), when it
runs, it polls a network device and stores the SNMP data in the DB. I
currently have this running in CRON every minute. Without putting a
loop
in my snmp_poller.rb code, I want to somehow tell CRON using a ruby
command line option, to run snmp_poller.rb 4 times.

I know there are a lot of command line, one liners to run ruby code
and
I was hoping someone had one to do this.

Hmmm, but how is that different from chaging echo $x with your script?
No trying to push that shell loop, just trying to understand the goal.

-- fxn

 

[jackster the jackle]

Hmmm, but how is that different from chaging echo $x with your script?
No trying to push that shell loop, just trying to understand the goal.

-- fxn

It's actually not different, I was just looking for another way to do it
for control purposes.

jackster.mobi

 

[Siep Korteling]

=

It's actually not different, I was just looking for another way to do it
for control purposes.

jackster.mobi

from the commandline:

ruby -e '4.times{`/usr/bin/SnmpPoll.rb` ; sleep 15}'


regards,

Siep

 

[Xavier Noria]

It's actually not different, I was just looking for another way to
do it
for control purposes.

Oh good.

Off the top of my head a possible approach would be:

ruby -e '4.times { load "path/to/file" }'

-- fxn

 

[jackster the jackle]

Off the top of my head a possible approach would be:

ruby -e '4.times { load "path/to/file" }'

-- fxn

That is exactly what I was looking for, Xavier! Thanks alot, that worked
perfectly.

jackster.mobi

 

[jackster the jackle]

=

from the commandline:

ruby -e '4.times{`/usr/bin/SnmpPoll.rb` ; sleep 15}'


regards,

Siep

Thanks for that added piece of information Siep, that might come in
handy for me.

jackster.mobi

 

[jackster the jackle]

My script is doing exactly what I want it to do now...but I see some
warnings in STDOUT:

warning: already initialized contstant <VARIABLE NAME HERE>

I think it's reporting this because ruby is looping through the file but
other than that, it's working fine.

Is there someway to fix this or at least prevent the warning from going
to the console?

thanks again

jackster.mobi

 

[Carlos J. Hernandez]

jacster:

You must be defining (assigning) the constant at one point in the
program flow, and
then defining again.
If the constant is in a loop, take it out.
I typically define all my constants within the first few lines at the
top of the file right after the require statements.

Ruby only warns that you're using a constant as a variable.
If you mean to use it as a variable, don't use capital letters.

-Carlos

 

[Xavier Noria]

My script is doing exactly what I want it to do now...but I see some
warnings in STDOUT:

warning: already initialized contstant <VARIABLE NAME HERE>

I think it's reporting this because ruby is looping through the file
but
other than that, it's working fine.

Indeed, that is the case with load. In the command line you can
silence warnings with -W0, like this:

fxn@feynman:~$ ruby -e 'C = C = 1'
-e:1: warning: already initialized constant C
fxn@feynman:~$ ruby -W0 -e 'C = C = 1'
fxn@feynman:~$

-- fxn

 

[jackster the jackle]

jacster:

You must be defining (assigning) the constant at one point in the
program flow, and
then defining again.
If the constant is in a loop, take it out.
I typically define all my constants within the first few lines at the
top of the file right after the require statements.

Ruby only warns that you're using a constant as a variable.
If you mean to use it as a variable, don't use capital letters.

-Carlos

Good call Carlos... my problem was that I was defining my variables
using some capital letters and didn't realize that was set aside for
constants.
I really appreciate the help!

jackster.mobi