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Full Discussion: Help to find the value in KB
Top Forums Shell Programming and Scripting Help to find the value in KB Post 302829703 by rveri on Friday 5th of July 2013 04:14:21 PM
Old 07-05-2013
Alister , you are right.
I never tried to validate the arithmetic output of awk happening from the script, and assuming it was right for the large numbers calculation as well.
Now I can see the difference , you have shown it precisely. Thank you.

These results are showing issue with awk arithmatic work :
Code:
$ awk 'BEGIN {printf "%.f\n%.f\n",2^53,2^53+1}'
9007199254740992
9007199254740992

Code:
$ awk 'BEGIN {printf "%.f\n%.f\n",2^53,2^53+2}'
9007199254740992
9007199254740994


Code:
$ awk 'BEGIN {printf "%.f\n%.f\n",2^60,2^60+1}'
1152921504606846976
1152921504606846976


#Correct result with bc:
Code:
$ echo "2^60+1"|bc
1152921504606846977

Adding 2 , looks result came ok, but not with 1. Also with the other examples as you have shown we see the issue when overflow happens with large values.

So here I am convinced that for large arithmetic work awk is not a very suitable tool but bc the arbitrary precision calculator to be use.

So as per the accurate arithmetic operation bc wins.


Thanks,
 

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LEARN ABOUT REDHAT

set_color

set_color(1)							       fish							      set_color(1)

NAME

       set_color - set_color - set the terminal color

set_color - set the terminal color
   Synopsis
       set_color [-v --version] [-h --help] [-b --background COLOR] [COLOR]

   Description
       Change the foreground and/or background color of the terminal. COLOR is one of black, red, green, brown, yellow, blue, magenta, purple,
       cyan, white and normal.

       o -b, --background Set the background color

       o -c, --print-colors Prints a list of all valid color names

       o -h, --help Display help message and exit

       o -o, --bold Set bold or extra bright mode

       o -u, --underline Set underlined mode

       o -v, --version Display version and exit

       Calling set_color normal will set the terminal color to whatever is the default color of the terminal.

       Some terminals use the --bold escape sequence to switch to a brighter color set. On such terminals, set_color white will result in a grey
       font color, while set_color --bold white will result in a white font color.

       Not all terminal emulators support all these features. This is not a bug in set_color but a missing feature in the terminal emulator.

       set_color uses the terminfo database to look up how to change terminal colors on whatever terminal is in use. Some systems have old and
       incomplete terminfo databases, and may lack color information for terminals that support it. Download and install the latest version of
       ncurses and recompile fish against it in order to fix this issue.

Version 1.23.1							  Sun Jan 8 2012						      set_color(1)
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