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:
Perl script:
Whith this input I can only get the negative numbers.
Like Buiten_t:-6.5
When I do:
I get only the positive numbers.
Buiten_t:28.6
If I let the
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.
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)
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
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So the output would look... (7 Replies)
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)
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+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.
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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)
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
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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)
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
LEARN ABOUT FREEBSD
integer
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)