Need command line to run a file 4 times

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

On Jan 11, 2008, at 2:47 PM, jackster the jackle wrote:

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

Xavier N. wrote:

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

On Jan 11, 2008, at 5:00 PM, jackster the jackle wrote:

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

Xavier N. wrote:

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

=

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 N. wrote:

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

Siep K. wrote:

=

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

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

jackster.mobi

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

warning: already initialized contstant

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

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

On Sat, 12 Jan 2008 03:03:50 +0900, “jackster the jackle”
[email protected] said:

On Jan 11, 2008, at 7:03 PM, jackster the jackle wrote:

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

warning: already initialized contstant

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:

 [email protected]:~$ ruby -e 'C = C = 1'
 -e:1: warning: already initialized constant C
 [email protected]:~$ ruby -W0 -e 'C = C = 1'
 [email protected]:~$

– fxn

Carlos Hernandez wrote:

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

On Sat, 12 Jan 2008 03:03:50 +0900, “jackster the jackle”

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

On Jan 11, 2008, at 5:13 PM, jackster the jackle wrote:

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

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