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Top Forums Shell Programming and Scripting variable inside variable inside loop headache Post 302326638 by hcclnoodles on Thursday 18th of June 2009 10:29:20 AM
Old 06-18-2009
variable inside variable inside loop headache

Hi Gurus

I have a file called /tmp/CMDB which looks like this

Code:
serial: 0623AN1208
hostname: server1
model: x4100
assetID: 1234

I am writing a for loop that will go through this file line by line creating a variable of itself. Using the first iteration of the loop (i.e. the first line) as an example, I want it to create a variable called

db_serial and populate it with value 0623AN1208

on the next iteration create a variable called

db_hostname and populate it with value server1

etc etc

so i have tried

Code:
cat /tmp/CMDB | while read n
do

VAR=db_`echo $n | cut -d: -f1`
VALUE=`echo $n | cut -d: -f2`

eval `echo $VAR`=`echo $VALUE`

done

# echo it all out after the loop has finished

echo "DB serial is set to $db_serial"
echo "DB hostname is set to $db_hostname"
echo "DB model is set to $db_model"
echo "DB Asset ID is set to $db_assetID"


Plus a whole load of other combinations and i just cant get the thing to work


Im sure the problem is with my use of the "eval" command which is effectively using another variable to create a variable, and assigning the value from another variable Smilie

does anybody know what im doing wrong ?Smilie
 

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echo(3XCURSES)						  X/Open Curses Library Functions					    echo(3XCURSES)

NAME
echo, noecho - enable/disable terminal echo SYNOPSIS
cc [ flag... ] file... -I /usr/xpg4/include -L /usr/xpg4/lib -R /usr/xpg4/lib -lcurses [ library... ] c89 [ flag... ] file... -lcurses [ library... ] #include <curses.h> int echo(void); int noecho(void); DESCRIPTION
The echo() function enables Echo mode for the current screen. The noecho() function disables Echo mode for the current screen. Initially, curses software echo mode is enabled and hardware echo mode of the tty driver is disabled. The echo() and noecho() functions control soft- ware echo only. Hardware echo must remain disabled for the duration of the application, else the behavior is undefined. RETURN VALUES
Upon successful completion, these functions return OK. Otherwise, they return ERR. ERRORS
No errors are defined. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |Unsafe | +-----------------------------+-----------------------------+ SEE ALSO
getch(3XCURSES), getstr(3XCURSES), initscr(3XCURSES), libcurses(3XCURSES), scanw(3XCURSES), attributes(5), standards(5) SunOS 5.11 5 Jun 2002 echo(3XCURSES)
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