how to get free memory of the unix system
 

i try

#!/bin/bash
free_memory = bootinfo -r

x = 'expr $free_memory*10'


why does it complaint -r command not found. but i try the command bootinfo -r in shell its ok

Use double quotes when you're storing the value of bootinfo into free_memory.

Assign variables without spaces, and use quotes for multiple words:

free_memory='bootinfo -r'

But I think you want command substitution:

free_memory=$(bootinfo -r)

You can avoid the expr call and use bash built-in arithmetic expansion:

(( x = free_memory * 10 ))

i try :

free_mem="bootinfo -r"

num_4k='expr free_mem*0.75/536870912'
num_64k='expr free_mem*0.85/134217728'

sed -n s/num_seg_4k=[0-9]*/num_seg_4k=$num_4k/p default
sed -n s/num_seg_64k=[0-9]*/num_seg_64k=$num_64k/p default

but it give the following error:

sed: 0602-404 Function s/num_seg_4k=[0-9]*/num_seg_4k=expr cannot be parsed.
sed: 0602-404 Function s/num_seg_64k=[0-9]*/num_seg_64k=expr cannot be parsed.


what could be wrong??

thanks

see my answer to your repeat of this qn in the other thr.
Don't do that again though.