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Full Discussion: Simple Variable substitution in ksh not working
Top Forums Shell Programming and Scripting Simple Variable substitution in ksh not working Post 302961000 by Don Cragun on Monday 23rd of November 2015 02:53:41 AM
Old 11-23-2015
mukesh.lalwani,
With any Korn shell, you can use arrays with a numeric subscript for subscripts from 0 to about 2047. With ksh93 and with bash you can use numeric subscripts with larger values or with string valued subscripts. The syntax is:
Code:
$ i=1
$ dbname[1]="tree"
$ echo "${dbname[$i]}"
tree
$

or for multiple array elements:
Code:
$ dbname=("forest" "tree")
$ for ((i = 0; i < ${#dbname[@]}; i++))
> do	printf 'dbname[%d]="%s"\n' "$i" "${dbname[$i]}"
> done
dbname[0]="forest"
dbname[1]="tree"
$

Or, with any shell based on Bourne shell syntax, you can use eval as shown in the link you referenced. Note that eval can be a security risk if any of the code that you are feeding to eval is supplied by a user. But, eval is generally safe if all of the strings being evaluated by eval are hardcoded into your script.

RTY,
Code:
$ echo $dbname$i

prints whatever $dbname expands to followed by whatever $i expands to not to the contents of the variable named by dbname followed by the expansion of $i.

And:
Code:
$ echo ${dbname$i}
ksh: syntax error: `$' unexpected
$

doesn't work either.
 

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LEARN ABOUT XFREE86

times

times(1)                                                           User Commands                                                          times(1)

NAME

       times - shell built-in function to report time usages of the current shell

SYNOPSIS

   sh
       times

   ksh
       times

DESCRIPTION

   sh
       Print the accumulated user and system times for processes run from the shell.

   ksh
       Print the accumulated user and system times for the shell and for processes run from the shell.

       On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

       1.  Variable assignment lists preceding the command remain in effect when the command completes.

       2.  I/O redirections are processed after variable assignments.

       3.  Errors cause a script that contains them to abort.

       4.  Words,  following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
           able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation  are  not
           performed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       ksh(1), sh(1), time(1), attributes(5)

SunOS 5.10                                                          15 Apr 1994                                                           times(1)
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