Sponsored Content
Top Forums Shell Programming and Scripting Perl output with negative and positive numbers Post 302380621 by rbl-blacklight on Tuesday 15th of December 2009 04:47:17 PM
Old 12-15-2009
Perl output with negative and positive numbers

Hello,

For my weather station I have made a little perl script to put the data into cacti. The next problem I have.
I can only get positive numbers or negative numbers.

What do I do:
Though a shell scrip I call the perl script.
Shell script:
Code:
#!/bin/sh
cat data.txt | stats.pl

Perl script:
Code:
while(<STDIN>) {
chomp;
if (s/^buiten_t[ ]*[:][ ]*(\D+\.*\d+\.*\d+).*/\1/) {
print "buiten_t:$_ ";
}

Whith this input I can only get the negative numbers.
Like Buiten_t:-6.5
When I do:
Code:
if (s/^buiten_t[ ]*[:][ ]*(\d+\.*\d+).*/\1/) {

I get only the positive numbers.
Buiten_t:28.6

If I let the
Code:
if (s/^buiten_t[ ]*[:][ ]*(\D+\.*\d+\.*\d+).*/\1/) {

for the positive numnbers there is a space in the output.
The ouput is then Buiten_t: 28.6

How do I make the script the it can workt with both settings?
Output like Buiten_t:-6.5 or Buiten_t:28.6

thnx

Last edited by Scott; 12-15-2009 at 06:06 PM.. Reason: Please use code tags - and no fancy colours and fonts. Reading RE's is hard enough. Thanks.
 

8 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Help in adding positive & negative values in a column

Hi Gurus, In my file I have an amount field from position 74 to 87, which contains values starting with '+' as well as '-'. I want to add all positive values in a varible called "CREDIT" and all negative values in a variable "DEBIT". I know, we can use grep to identify values with positive and... (4 Replies)
Discussion started by: berlin_germany
4 Replies

2. Shell Programming and Scripting

Finding the most positive and negative value and defining its position

Hi, I have a file that looks like this: Jake 2 3 4 6 4 3 -2 -1 Jerry 1 2 3 2 1 7 -6 -1 Timmy -1 -4 -5 -8 9 3 1 I want to find the most positive and negative value for each row and also define its position (based on column #) So the output would look... (7 Replies)
Discussion started by: gisele_l
7 Replies

3. Shell Programming and Scripting

Sorting positive and negative values

Hello, I have a list like this : 1 2 -4 0 -3 -7 5 6 etc. Is there a way to remove all the positive values and print only the negative values, without using grep, sed or awk? Thanks, Prasanna (4 Replies)
Discussion started by: prasanna1157
4 Replies

4. Shell Programming and Scripting

addition of both positive and negative numbers

Let, I have three numbers +00123.25 -00256.54 +00489.23 I need to sum up all those three numbers, after storing them in three variables (say var1, var2, var3). I used both expr and BC, but they didn't work for me. But, I am not able to sum up them, as I don't have any idea how to... (13 Replies)
Discussion started by: mady135
13 Replies

5. Shell Programming and Scripting

Find Where Values Change From Positive To Negative and viceversa

Hi all, I have a file that looks like shown below. I want to find places where the value in column 2 change from negative to positive and vice versa and return the value on column 1 at that point. I wonder if this is possible in shell script or awk .. please help! Here is the original data ... (6 Replies)
Discussion started by: malandisa
6 Replies

6. Shell Programming and Scripting

Splitting a file based on positive and negative numbers

Dear All, I have to split a tab delimited file in two files based on the presence of a positive or negative in column number 9 , for example file: A 1 5 erg + 6766 0.9889 0.9817 9.01882 erg inside upstream B 1 8 erg2 + 6766 0.9889 0.9817 -9.22 erg2 inside... (3 Replies)
Discussion started by: paolo.kunder
3 Replies

7. UNIX for Beginners Questions & Answers

Converting negative number to positive in a file

Hi ALL, I am having semi column separated file as below. I am having negative values for the records starting with 11095. How can I convert that positive number I tried this below seems not working sed 's/ \(*\)$/ -\1/;t;s/\(.*\)-/\1/ myfile myfile... (6 Replies)
Discussion started by: arunkumar_mca
6 Replies

8. UNIX for Beginners Questions & Answers

Splitting a file based on negative and positive numbers

I have a file that is pipe delimited and in Column F they have number values, both positive and negative. I need to take the one file I am starting with and split it into two separate files based on negative and positive numbers. What is the command to do so? And then I need to also transfer... (4 Replies)
Discussion started by: cckaiser15
4 Replies
integer(3pm)                                             Perl Programmers Reference Guide                                             integer(3pm)

NAME
integer - Perl pragma to use integer arithmetic instead of floating point SYNOPSIS
use integer; $x = 10/3; # $x is now 3, not 3.33333333333333333 DESCRIPTION
This tells the compiler to use integer operations from here to the end of the enclosing BLOCK. On many machines, this doesn't matter a great deal for most computations, but on those without floating point hardware, it can make a big difference in performance. Note that this only affects how most of the arithmetic and relational operators handle their operands and results, and not how all numbers everywhere are treated. Specifically, "use integer;" has the effect that before computing the results of the arithmetic operators (+, -, *, /, %, +=, -=, *=, /=, %=, and unary minus), the comparison operators (<, <=, >, >=, ==, !=, <=>), and the bitwise operators (|, &, ^, <<, >>, |=, &=, ^=, <<=, >>=), the operands have their fractional portions truncated (or floored), and the result will have its fractional portion truncated as well. In addition, the range of operands and results is restricted to that of familiar two's complement integers, i.e., -(2**31) .. (2**31-1) on 32-bit architectures, and -(2**63) .. (2**63-1) on 64-bit architectures. For example, this code use integer; $x = 5.8; $y = 2.5; $z = 2.7; $a = 2**31 - 1; # Largest positive integer on 32-bit machines $, = ", "; print $x, -$x, $x + $y, $x - $y, $x / $y, $x * $y, $y == $z, $a, $a + 1; will print: 5.8, -5, 7, 3, 2, 10, 1, 2147483647, -2147483648 Note that $x is still printed as having its true non-integer value of 5.8 since it wasn't operated on. And note too the wrap-around from the largest positive integer to the largest negative one. Also, arguments passed to functions and the values returned by them are not affected by "use integer;". E.g., srand(1.5); $, = ", "; print sin(.5), cos(.5), atan2(1,2), sqrt(2), rand(10); will give the same result with or without "use integer;" The power operator "**" is also not affected, so that 2 ** .5 is always the square root of 2. Now, it so happens that the pre- and post- increment and decrement operators, ++ and --, are not affected by "use integer;" either. Some may rightly consider this to be a bug -- but at least it's a long-standing one. Finally, "use integer;" also has an additional affect on the bitwise operators. Normally, the operands and results are treated as unsigned integers, but with "use integer;" the operands and results are signed. This means, among other things, that ~0 is -1, and -2 & -5 is -6. Internally, native integer arithmetic (as provided by your C compiler) is used. This means that Perl's own semantics for arithmetic operations may not be preserved. One common source of trouble is the modulus of negative numbers, which Perl does one way, but your hardware may do another. % perl -le 'print (4 % -3)' -2 % perl -Minteger -le 'print (4 % -3)' 1 See "Pragmatic Modules" in perlmodlib, "Integer Arithmetic" in perlop perl v5.12.1 2010-04-26 integer(3pm)
All times are GMT -4. The time now is 07:26 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy