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Top Forums Shell Programming and Scripting Shell script to find Memory status in AIX Post 302663015 by a1_win on Wednesday 27th of June 2012 12:05:35 PM
Old 06-27-2012
Shell script to find Memory status in AIX

Hi All,

There is a shell script that captures Memory status in AIX 6.1 64 bits!

I need it to be validated by shell script experts for the following:

Shell Script:

Code:
cat memusageAIX.sh

#!/usr/bin/ksh
#
# Memory usage under AIX
#

USED=`svmon -G | head -2 | tail -1 | awk '{ print $3 }'`
USED=`expr $USED / 256`
TOTAL=`lsattr -El sys0 -a realmem | awk '{ print $2 }'`
TOTAL=`expr $TOTAL / 1024`
FREE=`expr $TOTAL - $USED`

echo "\nMemory Information"
echo "=================="
echo "total memory = $TOTAL MB"
echo "free memory  = $FREE MB"
echo "used memory  = $USED MB"

exit 0

Code:
Question:

Why USED is divided by 256 in the above shell script :

USED=`expr $USED / 256`

How did we arrive at 256 figure? 

What is the significance of it?

Thanks for your time!

Regards,
 

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COLORS(3)						   libbash colors Library Manual						 COLORS(3)

NAME
colors -- libbash library for setting tty colors. SYNOPSIS
colorSet <color> colorReset colorPrint [<indent>] <color> <text> colorPrintN [<indent>] <color> <text> DESCRIPTION
General colors is a collection of functions that make it very easy to put colored text on tty. The function list: colorSet Sets the color of the prints to the tty to COLOR colorReset Resets current tty color back to normal colorPrint Prints TEXT in the color COLOR indented by INDENT (without adding a newline) colorPrintN The same as colorPrint, but trailing newline is added Detailed interface description follows. Available colors: Green Red Yellow White The color parameter is non-case-sensitive (i.e. RED, red, ReD, and all the other forms are valid and are the same as Red). FUNCTIONS DESCRIPTIONS
colorSet <color> Sets the current printing color to color. colorReset Resets current tty color back to normal. colorPrint [<indent>] <color> Prints text using the color color indented by indent (without adding a newline). Parameters: <indent> The column to move to before start printing. This parameter is optional. If ommitted - start output from current cursor position. <color> The color to use. <color> The text to print. colorPrintN [<indent>] <color> The same as colorPrint, except a trailing newline is added. EXAMPLES
Printing a green 'Hello World' with a newline: Using colorSet: $ colorSet green $ echo 'Hello World' $ colorReset Using colorPrint: $ colorPrint 'Hello World'; echo Using colorPrintN: $ colorPrintN 'Hello World' AUTHORS
Hai Zaar <haizaar@haizaar.com> Gil Ran <gil@ran4.net> SEE ALSO
ldbash(1), libbash(1) Linux Epoch Linux
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