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Full Discussion: awk and printf
Top Forums Shell Programming and Scripting awk and printf Post 302306749 by vidyadhar85 on Monday 13th of April 2009 05:03:12 PM
Old 04-13-2009
Quote:
Originally Posted by xgringo
echo $bbsize
1.5

echo $fillpercent

.95

echo $bbsize | awk '{printf "%.2f\n",$0*$fillpercent}'

2.25
echo $bbsize | awk '{printf "%.2f\n",$0*.95}'
1.42

1.42 is what I'm expecting...

echo $blocksize
4096
echo $bbsize | awk '{printf "%.2f\n",$0*$blocksize}'
2.25
echo $bbsize | awk '{printf "%.2f\n",$0*4096}'
6144.00

6144 is what I'm EXPECTING.

Where am I going wrong?
you can't use the shell variable inside awk directly
Code:
 
echo 1.5|awk -v var=$fillpercent '{printf "%.2f\n",$0*var}'

this will give the req ans
 

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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.11 3 Aug 1994 echo(1B)
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