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Shell Programming and Scripting
variable part of variable name
Post 302161685 by Smoker on Friday 25th of January 2008 12:11:40 PM
01-25-2008
Quote:
Hi,
I'm not sure this answer suits to your request (if you meant
"how to display/store or use the resulting value", then this
should help...).
First, the 2 first lines sound correct for both defining a variable
and assigning a value to it:
me@host> A="PRE"
me@host> eval ${A}_DAY=`date +%d`
In order to solve this kind of trouble, I usually use this
kind of syntax:
me@host> DAY_VALUE=$(unalias echo; eval echo $"${A}_DAY")
me@host> echo ${DAY_VALUE}
me@host> 25
Hope it helps,
Christophe
I'm not sure this answer suits to your request (if you meant
"how to display/store or use the resulting value", then this
should help...).
First, the 2 first lines sound correct for both defining a variable
and assigning a value to it:
me@host> A="PRE"
me@host> eval ${A}_DAY=`date +%d`
In order to solve this kind of trouble, I usually use this
kind of syntax:
me@host> DAY_VALUE=$(unalias echo; eval echo $"${A}_DAY")
me@host> echo ${DAY_VALUE}
me@host> 25
Hope it helps,
Christophe
echo $(eval echo \$${A}_DAY)
eval echo "\$${A}_DAY"
Thank You for your answer
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LEARN ABOUT SUNOS
printenv
printenv(1B) SunOS/BSD Compatibility Package Commands printenv(1B) NAME
printenv - display environment variables currently set SYNOPSIS
/usr/ucb/printenv [variable] DESCRIPTION
printenv prints out the values of the variables in the environment. If a variable is specified, only its value is printed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), sh(1), stty(1), tset(1B), attributes(5), environ(5) DIAGNOSTICS
If a variable is specified and it is not defined in the environment, printenv returns an exit status of 1. SunOS 5.10 14 Sep 1992 printenv(1B)