Retrieving random numbers out of a text file Post: 302267521

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Top Forums UNIX for Dummies Questions & Answers Retrieving random numbers out of a text file Post 302267521 by nistleloy on Friday 12th of December 2008 02:39:19 PM

12-12-2008

Registered User

Great stuff guys, thank you for that.

I hate to tap your brains again but here goes:

Now that I have just the numbers displayed within the file is there anyway I can call upon the numbers in a script so I can perform the workings out on them?

What i'm trying to achieve to get is the difference between the readings:

1st reading - 2nd reading
3rd reading - 4th reading

but I'm not sure on how to get these random numbers into a script.

I have a few thoughts:

Should I turn them into variables within the file and then use the variables in my script

ie edit the text file from my script and turn each number into a variable, so it'll look something like this:

Code:

nistleloy@****:~/Documents> cat tempIP
r1=6643
r2=6718
r3=7293
r4=7785

then call upon them in my script to do the maths - how would I assign the varibles within my script and how do I get these variables into my script?

OR:

is there a way to select line 1 from the file and make it a variable in my script then line 2 etc (remembering that these numbers are random so "greping" will not work).

Regards

nistleloy

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service

service(8)						      System Manager's Manual							service(8)

NAME

       service - run a System V init script

SYNOPSIS

       service SCRIPT COMMAND [OPTIONS]

       service --status-all

       service --help | -h | --version

DESCRIPTION

       service	runs a System V init script in as predictable an environment as possible, removing most environment variables and with the current
       working directory set to /.

       The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT.  The  supported  values  of  COMMAND  depend  on  the
       invoked	script.  service passes COMMAND and OPTIONS to the init script unmodified.  All scripts should support at least the start and stop
       commands.  As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the start  com-
       mand.

       service --status-all runs all init scripts, in alphabetical order, with the status command.

EXIT CODES

       service calls the init script and returns the status returned by it.

FILES

       /etc/init.d
	      The directory containing System V init scripts.

ENVIRONMENT

       LANG, TERM
	      The only environment variables passed to the init scripts.

SEE ALSO

       /etc/init.d/skeleton,
       update-rc.d(8),
       init(8),
       invoke-rc.d(8).

								     Jan 2006								service(8)