by David Stabl » Tue, 14 May 1996 04:00:00
Sounds like you needQuote:>I want to be able to get $(value_of_result) so that it is
>equal to $1 or more exactly I want to get to the value of $1 where the
>value of result=1 by $(value_of_result)...
A=`eval echo \$$RESULT`
where the first pass results in a $ followed by the value of RESULT,
which is then turned over to echo, and set into the variable A when
command substitution occurs.
The problem is, \$$ returns the current PID.
Can someone refine this so that it works?
-d.
by Raymond Canfiel » Tue, 14 May 1996 04:00:00
Ok, here is a question for ya...
If I am running a sh script and I do a set `ls ~/txt/` and I am also
setting select as a number between 1 and the number of files in ~/txt/
as "result", I want to be able to get $(value_of_result) so that it is
equal to $1 or more exactly I want to get to the value of $1 where the
value of result=1 by $(value_of_result)...
thanks...
--
-rwc
System Installation / Maintenance - Digital Express Group, Inc.
by Andreas Schw » Thu, 16 May 1996 04:00:00
|>> I want to be able to get $(value_of_result) so that it is
|>> equal to $1 or more exactly I want to get to the value of $1 where the
|>> value of result=1 by $(value_of_result)...
|> Sounds like you need
|> A=`eval echo \$$RESULT`
|> where the first pass results in a $ followed by the value of RESULT,
|> which is then turned over to echo, and set into the variable A when
|> command substitution occurs.
|> The problem is, \$$ returns the current PID.
|> Can someone refine this so that it works?
Use this, which also saves a process:
eval value_of_result=\$$result
--
Andreas Schwab "And now for something
by Parris Geis » Thu, 23 May 1996 04:00:00
Of course there is always another way ...
eval print '$'$name
parris
1. Better Way to Get Value of Value of Variable in Bourne shell?
Hi
I need to create a Bourne shell function that can change/manipulate the values
of the given variable names, e.g.
$ P1=John
$ P2=Jane
$ P3=Paul
$ echo "1=$P1, 2=$P2, 3=$P3."
1=John, 2=Jane, 3=Paul.
$ add_prefix Hi_ P1 P2 P3
$ echo "1=$P1, 2=$P2, 3=$P3."
1=Hi_John, 2=Hi_Jane, 3=Hi_Paul.
After several trial-and-error, I finally got the add_prefix() working, but I
think my solution is too complicated and inefficient, specifically the
"eval $var='$prefix`eval echo \\$$var`'" that takes 2 evals and 1 command
substitution, as shown below.
add_prefix () {
prefix=$1
shift
for var in $*; do
eval $var='$prefix`eval echo \\$$var`'
done
}
Can any Bourne shell programming guru show me a more concise, efficient and
elegant way in writing the add_prefix() function without using any external
command?
Is there any shorter syntax like ${$var} in Bourne shell that can replace
`eval echo \\$$var` ? Something concise and simpler will be helpful because
the actual function I need to write is much more complicated than add_prefix()
function shown above.
Thanks. I appreciate your help.
Regards
Hon-Chi
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